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Frequently Asked Questions

Chromx® Rebar FAQ

The following questions and answers provide information about specific interests as well as links to supporting resources and documents regarding ChromX® steel. Should you have additional questions, consult the documents and studies in the Resource Library, or contact your regional sales representative HERE.

What does ChromX® stand for?

The product brand name, ChromX®, combines the alloying element, ferrochrome or chrome, with the “X” adopted as a symbol for steel. While only one element of the process - ferrochrome - plays an important role in the production of ChromX® steels, our products are produced through a combination of steel alloys and controlled manufacturing processes.

What does MMFX® mean?

MMFX® stands for Martensitic Microcomposite Formable Steel. In its formation, the company adopted this name to pay homage to the material science technology on which it was based. All MMFX® steels include a martensitic phase, combined with other steel phases, such as austenite, that gives our steel its advantageous properties.

How long have ChromX® products been on the market?

The initial production of ChromX® steel reinforcing bar was in 2001 and it has been selling as a leading high-strength, corrosion-resistant steel in the market since 2002.

Is ChromX®’s nanotechnology patented?

ChromX®’s nanotechnology is protected by six U.S. patents and related filings in approximately 50 countries and regions. Importantly, the patents cover both the manufacturing process and the unique microstructure of the steel.

Is ChromX® steel proprietary?

ChromX® steels are proprietary, but are sold under a general non-proprietary specification. To support the use of innovation by state and federal departments, the FHWA issued a memorandum titled Guidance on Patented and Proprietary Product Approvals, dated November 30, 2011. This release introduced revised guidance on the application of 23 CFR 635.411 Material or product selections. The regulation generally prohibits the use of federal funds in payment of any premium or royalty on any proprietary material, specification, or process specifically set forth in the plans or specifications for a project; however, the regulation and revised FHWA Guidance lay out several exemptions allowing the use of proprietary products, which include competitive bidding or certification that no equally suitable alternative exists.

There is no other product on the market today offering the high strength with ductility and uncoated corrosion resistant properties of ChromX®, along with the benefits derived from these properties; therefore, state transportation departments can certify that there is no equally suitable alternative. Otherwise, if the state believes that suitable equals exist, the state can include ChromX® in their specifications along with those suitable equals.

What are the ChromX® product lines?

MMFX® applies its nanotechnology to produce and sell high strength-concrete reinforcing products named ChromX® with varying levels of corrosion resistance so that owners, developers and structural engineers can design using high strength efficiencies, while selecting the product that best fits the service life expectation for the given structure.

ChromX® is categorized as follows:

ChromX® 9000 Series - This high-level corrosion resistant steel comes in Grade 100 (690) and 120 (830) and provides over 100 years of service life in concrete.

ChromX® 4000 Series - This mid-level corrosion resistant steel also comes in Grade 100 (690) and 120 (830) and provides approximately 40 – 60 years of service life in concrete, depending on the specific application and design.

ChromX® 2000 Series - This low-level corrosion resistant steel product offers the high strength properties of 100 KSI (690 MPa) and 120 KSI (830 MPa) yield strength for applications where corrosion is less of a concern.

ChromX® steels are made in the following products:

  • Straight and coiled deformed rebar
  • Smooth rounds
  • Dowel bars
  • Wire rod
  • Flats
  • Williams Form Engineering product line: threaded bar, soil nails, tie-backs & tie-downs, micro-piles, rock anchors, guy anchors, wind turbine foundation bolts and marine bulkhead wall tie-rods
  • Couplers (made of ChromX® by Barsplice, Erico, Detra, Williams Form and HRC)
  • Additional products, such as wire and strand, are in development

How is ChromX® produced?

ChromX® is produced through a combination of alloy additions and a controlled manufacturing process. The combination of the steel’s chemical composition and production process develops the unique microstructure of the steel that drives the advantageous product properties.

ChromX® steel bars are manufactured by Commercial Metals Company at CMC Steel in Cayce, South Carolina, and by Cascade Steel Rolling Mills, Inc. in McMinnville, Oregon. 

Who is the largest consumer of ChromX®?

We do not publish our customer list, but there are numerous specifications that drive the sale of ChromX® into states’ bridge works, marine concrete works and large commercial construction projects. VDOT’s and Alberta’s CRR policies are significant recognitions of the benefits of ChromX® for the infrastructure market. 

How long will it take to supply and deliver ChromX® to a jobsite? What is the lead time?

CMC maintains an inventory of products at locations across the country that is available to ship immediately. Lead time for steel that is not in inventory, such as special orders, should take no more than 45 – 60 days.

What sizes and lengths does ChromX® rebar come in? Can I get special lengths?

ChromX® steel reinforcing bar standard lengths are 40' and 60' for #4 through #11, #14 and #18, and 40' for #3 straight bar sizes. #3 and #4 rebar are also available in coil.
 
Custom mill-cut lengths are available by special order, minimum 20 feet and up to 80 feet maximum; minimum order required.

Does ChromX® weigh the same as standard rebar?

Yes. ChromX® weighs the same for similar lengths and diameters.

Is ChromX®produced under ASTM and AASHTO Specifications?

ChromX® 9000, 4000 and 2000 Series are produced in full accordance to ASTM International – ASTM A1035 (2016b), Standard Specification for Deformed and Plain, Low-Carbon, Chromium, Steel Bars for Concrete Reinforcement, Grades 100 & 120 types CS, CM and CL, respectively. ChromX® series meet and exceed ASTM A615-15 Grade 100.

ChromX® 9000 Series is produced in full accordance to AASHTO M 334M/M 334 (2017) Standard Specification for Uncoated, Corrosion-Resistant, Deformed and Plain Alloy, Billet-Steel Bars for Concrete Reinforcement and Dowels Grade 100.

What is the alloy content of ChromX®?

ChromX® is a low-carbon, chromium alloy steel bar. ChromX® 9100 and 9120, 4100 and 4120, and 2100 and 2120 rebar shall meet the requirements of Table 1 as per ASTM A1035-15.

Table 1– Maximum Chemical Constituents (Weight %) 
AlloyType Carbon Chromium Manganese Nitrogen Phosphorus Sulfur Silicon
ChromX® 9100
and 9120
0.15% 8.0 - 10.9%(A) 1.5% 0.05% 0.035% 0.045% 0.50%
ChromX® 4100
and 4120
0.20% 4.0 - 7.9% 1.5% 0.05% 0.035% 0.045% 0.50%
ChromX® 2100
and 2120
0.30% 2.0 - 3.9% 1.5% 0.05% 0.035% 0.045% 0.50%
(A)AASHTO M 334 M/M 334 - 17 has a minimum 9.2% Cr content. 

How do engineers specify ChromX®?

ChromX® 9000, 4000 and 2000 products can be specified as reinforcing bars conforming to ASTM A1035-15 CS, CM, CL, respectively, along with the grade designation (100 or 120). For highways and bridge applications, according to AASHTO, ChromX® 9100 products can be specified as low chromium reinforcing bars conforming to AASHTO M 334 M/M 334 along with the grade designation (100).

What types of applications should engineers consider using ChromX® steel reinforcing bars?

ChromX® 9000 and 4000 Series rebar are ideal for reinforcing concrete structural members and systems exposed to, or in direct contact with, corrosive conditions. Whether ChromX® 9000 or 4000 is used in these corrosive environments depends on the target service life for the project.

ChromX® 9000 has been successfully used since 2002 in bridge decks and beams, foundation piles and systems, pavement dowel and tie bars, diaphragm walls, marine structures and seawalls, industrial equipment foundations and exposed balconies.

The high strength properties of ChromX® 9000, 4000 and 2000 Series steel bars allow for more efficient and cost-effective designs and construction, improved constructability by easing congestion and shortened construction schedules. High strength applications include: building mat foundations and shear walls, parking garages, bridge superstructures, and hydroelectric dams.

What types of projects have been built with ChromX®?

ChromX® has been used in various public infrastructure and public/private development projects in the United States, Canada, Mexico, Puerto Rico, Bahamas and the Middle East. It has been used in bridges (abutments, columns, girders and decks), floating decks, Navy piers, high-rise mat foundations and shear walls, pavement dowels, precast pilings and substructures. Learn more about projects around the world built using ChromX® HERE.

How do engineers design with ChromX® Grade 100? Are there guidelines designers can refer to?

Engineers shall comply with applicable building codes by cities, counties and states, ACI 318 and IBC 2009, 2012 and 2015. In addition, designers shall be guided by the ACI-ITG6 and ICC ESR-2107, which provide design guidelines on the use of ASTM A1035 up to 100 ksi yield in structural designs. The AASHTO LRFD Bridge Design Specifications also provides guidance for designing bridges up to 100 ksi yield strength.

Additionally, we offer design guidance and assistance to engineers when they are faced with unique structural challenges. Our experienced sales team can provide high strength, innovative solutions that mitigate construction challenges and improve constructability with cost competitive, jointly-developed solutions. To learn about our pre-construction services, click HERE.

Can engineers design with ChromX® in accordance to the International Building Codes (IBC)?

ICC ESR-2107 provides design guidelines on the use of ASTM A1035 up to 100 ksi yield in structural designs in accordance to the Acceptance Criteria ICC AC429, thereby conforming to the requirements of IBC 2009, 2012 and 2015.

Can engineers design with ChromX® in accordance to the American Concrete Institute (ACI)?

In 2010, the ACI published the ITG-6R-10, Design Guide for the Use of ASTM A1035/A1035M Grade 100 Steel Bars for Structural Concrete, which guides engineers to safely design with ASTM A1035/A1035M at a yield strength of 100 ksi.

Can engineers design with ChromX® in accordance to the Canadian Standards Association (CSA)?

Currently, there are no Canadian specifications and standards that cover the ChromX® products or their use in concrete design. The numerous Canadian projects that ChromX® has been used in have been constructed to ACI, ICC-ES or AASHTO design standards or standards specific to agencies in a province. However, we are currently working with the CSA to incorporate ChromX® products into the CSA specifications of approved material and 100 ksi design specifications.

Does AASHTO allow the usage of ChromX®? What strength does AASHTO allow?

Yes, the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications, 7th Edition 2014, allows the use of steel reinforcing bar up to 100 KSI (690 MPa). Therefore all ChromX® series that are certified in accordance to ASTM A1035/A1035M and/or AASHTO M334 M/M 334 are allowable.

What DOT’s have accepted the usage of ChromX®?

DOTs that have realized the benefits by designing and/or constructing with ChromX® in bridge decks, other structural members, and/or using pavement dowels include: Alabama, Arizona, California, Colorado, Connecticut, Delaware, Florida, Idaho, Indiana, Iowa, Kentucky, Massachusetts, Maine, Michigan, New Hampshire, New Mexico, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Utah, Vermont, Virginia, Washington and Wisconsin. Canadian MOTs of British Columbia, Alberta, Manitoba, and New Brunswick have also used ChromX®.

What parts of a bridge can ChromX® be used in?               

ChromX® 9000, 4000 and 2000 series can be used for reinforcing all bridge members. ChromX® has been used in bridge abutments, columns, caps, girders, decks (top and bottom mats), curbs, and parapets since its inception. AASHTO LRFD Bridge Design Specifications, 8th Edition 2017, allows the use of ChromX® up to 100 KSI (690 MPa).

Does ChromX® perform well in the presence of chlorides and de-icing salt?

Yes. ChromX® 9000 products are five times more corrosion resistant than carbon steel rebar. Their chloride threshold, the level of chloride concentration at which corrosion initiates, is four times higher and their corrosion rate is one-third the rate of conventional rebar. The combination of ChromX® 9000’s higher chloride threshold and slower corrosion rate provides a 100-year service life in concrete. Extending the operational service life – the time from construction to first repair – significantly lowers life-cycle costs, especially important for bridges, marine piles and severe soil applications. Similarly, ChromX® 4000 products have a chloride threshold that is three times that of conventional rebar and again a much slower corrosion rate. ChromX® 4000 can provide a service life in concrete of 40 to 60 years, depending on the specific application and design.

Is there test data available to prove ChromX® 9000 products will last 100 years?

Numerous independent third-party testing studies, such as universities and state DOTs, have found ChromX® 9000 products provide a service life of over 100 years.  Given that many of these studies were written prior to our product line expansion, they often mention MMFX2 when referring to the ChromX® 9000 series. Learn more HERE.

How does ChromX® compare with epoxy-coated rebar (ECR) for corrosion-resistance?

ChromX® 9000 products significantly outperform ECR for corrosion resistance. Many field studies show that ECR adds little to no corrosion protection or additional service life due to the damage and failure of the epoxy coating in the field. ECR is estimated to provide roughly 30 years of service life, while the ChromX® 9000 series provides over 100 years; the ChromX® 4000 series provides 40 to 60 years, depending on the specific application and design.

The ChromX® products are also simpler to handle in the field. Because ChromX® is uncoated and relies on its unique microstructure for its corrosion resistance, it does not have special handling requirements like galvanized, epoxy-coated or stainless steel bars. ChromX® rebar can be handled just like conventional carbon steel bars. Learn more HERE.

How does ChromX® compare with galvanized rebar for corrosion-resistance?

ChromX® 9000 products outperform galvanized rebar for corrosion resistance. Many field studies show that galvanizing rebar adds only a few years to the service life, far below the 100 years provided by the ChromX® 9000 Series. One such study, Critical Chloride Corrosion Threshold for Galvanized Reinforcing Bars, David Darwin, et. al., The University of Kansas Center for Research, Inc. (Dec. 2007), measured the chloride threshold of ChromX® 9000 at 2.5 times higher than galvanized rebar. Learn more HERE.

ChromX® 4000 products are currently estimated to provide comparable corrosion resistant performance to galvanized bars. The University of Kansas study referenced above found that galvanized rebar has a chloride threshold of 1.6 times that of conventional steel. Comparably, the chloride threshold of ChromX® 4000 has been measured at 2 times that of conventional steel, resulting in ChromX® 4000’s chloride threshold that is more than 1.2 times higher than that of galvanized steel.

Also, the ChromX® products are simpler to handle in the field. Because ChromX® relies on its unique microstructure for its corrosion resistance and is not coated, it does not have special handling requirements like galvanized, epoxy-coated or stainless steel bars. ChromX® rebar can be handled just like conventional carbon steel bars. Learn more HERE. 

How does ChromX® compare with stainless steel (SS) rebar?

ChromX® 9000 Series are the most comparable products to stainles steel (SS) rebar. ChromX® 9000 and SS rebar are the only products that provide over 100-year service life in concrete, yet ChromX® 9100 and 9120 are one-third to one-half the cost of SS rebar, depending on the SS grade selected. ChromX® 9000 products have been designated the most cost-effective solution for corrosion by the Virginia Transportation Research Council (VTRC).

Furthermore, ChromX® rebar can be handled just like conventional steel bars, without the special handling requirements associated with SS bars. For example, ChromX® is not considered dissimilar to carbon steel for galvanic corrosion purposes. Therefore, ChromX® does not need to be isolated from carbon steels in construction, as stainless steel bars do. Learn more HERE.

What is the cost comparison between ChromX® 9100 and corrosion resistant products on the market?

Bar for bar, in-place cost estimates for ChromX® 9100 rebar are approximately one-half the cost of stainless steel rebar. It is roughly 30% more than galvanized and 50% more than ECR bar for bar; however, the additional handling and field costs of galvanized and ECR need to be taken into account. ChromX® 9100 also outperforms both galvanized and ECR for corrosion resistance resulting in the lowest life-cycle cost over the competing products. In fact, upon the first repair of structures built with galvanized rebar or ECR, the costs are estimated at 5 times or more than if constructed with ChromX® 9100 rebar.

ChromX®  is also a high-strength rebar. Therefore, the high strength efficiencies offered by ChromX®’s 100 or 120 KSI yield strength can lower upfront costs that more than offset the bar for bar premium cost, resulting in significant net construction cost savings. Example calculations are available based on specific project assumptions and factors.

What is the cost comparison between ChromX® 4100 and epoxy or galvanized rebar?

Based on bar-for-bar in-place cost estimates, ChromX® 4100 rebar is comparable in cost to galvanized and/or epoxy-coated rebar (ECR). However, the additional handling and field costs of galvanized and ECR need to be taken into account. Furthermore, ChromX® 4100 outperforms both galvanized and ECR for corrosion resistance resulting in the lowest life cycle cost over the competing products.

ChromX®  is also a high-strength rebar. Therefore, the high strength efficiencies offered by ChromX®’s 100 or 120 KSI yield strength can lower upfront costs that more than offset the bar for bar premium cost, resulting in significant net construction cost savings. Example calculations are available based on specific project assumptions and factors.

What is the cost comparison between ChromX® 2100 and conventional black bar?

ChromX® 2100 has a high strength cost premium over conventional Grade 60 and Grade 75 rebar; however, the high strength efficiencies offered by ChromX®’s 100 or 120 ksi yield strength more than offset the bar for bar premium, resulting in significant net construction cost savings. Example calculations are available based on specific project assumptions and factors.

ChromX® 2100 is competitively priced against ASTM A615 Grade 100 rebar, and also offers better and more consistent mechanical properties, such as a tensile-to-yield (T/Y) ratio over 1.25.

What is yield strength?

A yield strength or yield point of a material is defined in engineering and materials science as the stress at which a material begins to deform plastically. Prior to the yield point the material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible.

What is ultimate tensile strength?

Ultimate tensile strength, often shortened to tensile strength or ultimate strength, is the maximum stress that a material can withstand while being stretched or pulled before failing or breaking. The ultimate tensile strength is usually found by performing a tensile test and recording the engineering stress versus strain. It is the highest point of the stress-strain curve.

What is modulus of elasticity?

Young’s modulus, sometimes called the modulus of elasticity, also known as the tensile modulus or elastic modulus, is a measure of the stiffness of an elastic material and is a quantity used to characterize materials. It is defined as the ratio of the stress along an axis over the strain along that axis in the range of stress in which Hooke’s law holds. ChromX® has a modulus of elasticity (E) of 29 x 106 psi.

What is the development length of steel reinforcing bar?

Developing the proper lap length of concrete-embedded rebar is crucial for obtaining the rebar’s full tensile capacity. If the overlap distance is less than the defined development length (i.e. the minimum lap length required), the bar will pull out of the concrete. According to ACI 318, the development length is based on the attainable average bond stress over the length of embedment of the reinforcement. The development length is a function of the steel bar yield stress, the concrete compressive strength, the distance between the bar and the edge of the concrete (“clear cover”), and the bar diameter.

How does one determine the developing length of ChromX® rebar?

The process for determining the development length of ChromX® ASTM A1035/A1035M CS, CM and CL Grade 100 rebar is consistent with conventional reinforcing steel grades with slight changes to the applicable equations. In 2010, the American Concrete Institute (ACI) published the ITG-6R-10 Design Guide for the Use of ASTM A1035/A1035M Grade 100 Steel Bars for Structural Concrete, which guides engineers to safely design structures using ASTM A1035/A1035M up to a yield strength of 100 ksi. The ACI ITG-6R-10 slightly modified the equations in ACI 408R-03 Bond and Development of Straight Reinforcing Bars in Tension for both confined and unconfined ASTM A1035/A1035M Grade 100 rebar. Learn more HERE.

Does ChromX® have similar bond strength as conventional rebar?

ChromX® steel bars have similar concrete bond strength as compared to conventional rebar. It provides better bond strength than coated corrosion-resistant rebar such as epoxy-coated and galvanized. For example, to develop the proper lap length of concrete-embedded epoxy-coated rebar, a 20% additional embedment in length is required compared to ChromX® rebar in similar applications to provide similar bond strength.

If builders have a rebar congestion issue, can ChromX® help?

Yes. One of the major benefits of ChromX® steel is the high strength properties and the potential to help reduce rebar congestion. Using Grade 100 or Grade 120 reinforcing steel can reduce rebar requirements from 20 – 40% over Grade 60 reinforcing steel.

Are high strength couplers available for mechanically splicing ChromX®?

High-strength mechanical splices and anchorages are available from multiple coupler manufacturers. Additionally, couplers made from ChromX® materials can be purchased from these coupler manufacturers. Learn more HERE.

Can ChromX be used in seismic zones?

The use of ChromX® rebar in seismic zones 3 and 4 and SDC D, E and F is limited to transverse reinforcement for concrete confinement with fyt up to 100 ksi for special moment frames and special structural walls as permitted by Section 21.1.5.4 of ACI 318-08; however, in foundation mats where seismic movement isn’t an issue, ChromX® rebar can be used for longitudinal and transverse concrete reinforcement. A number of studies are underway to expand the applications of ChromX® products in high seismic zones. Learn more HERE.

Is ChromX® more brittle due to its high-strength?

ChromX® steel bars have the same minimum ductility as conventional steel bars and superior ductility compared to other high strength products due to its microstructure. There is no compromise between strength and ductility. Each heat and each size produced from that heat receives a bend test per ASTM and the results are recorded on the certified material test report (MTR).

Can ChromX® products exceed the bend requirements of ASTM A615? Can they be field bent?

Engineers shall follow the ACI-ITG6 Sec 10.4 on bending which refers to ACI 318-08 Sec 7.2 on minimum bending diameter requirements. The same applies to conventional black steel. ChromX® rebar can be field bent per ACI 318, which prohibits heat bending and bending bars embedded in concrete. Designers shall follow the ACI-ITG6 Sec 10.4 on bending which refers to ACI318-08 Sec 7.2 on rebar bending requirements.
 

Heat bending is prohibited, because heat can adversely impact the high strength and the high corrosion resistant properties of ChromX® steel reinforcing bars.

Can ChromX® be welded? Do you have a welding protocol?

ACI-ITG6 Sec 10.4 restricts welding, but it also refers designers to ASTM A1035 Note 2 that states welding should be approached with caution. We are working on the development of a welding protocol.

Can ChromX® be threaded?

Yes. ChromX® can be rolled and cut threaded. Learn more HERE.

Is ChromX® referenced in the U.S. Army Corps of Engineers Guide Specifications?

Yes. ASTM A1035 is referenced in USACE Unified Facilities Guide Specifications, Division 03 – Concrete, Section 03 20 00.00 10, Concrete Reinforcing.

Can I get fabricated ChromX® rebar from you?

Yes. CMC Rebar is the fabrication division of our company and they can provide a quote for job-specific fabricated ChromX® rebar, as well as black bar. To find your local CMC Rebar sales representative, click HERE.

Is it easy to fabricate ChromX®? Is there a special procedure for handling?

ChromX® steel rebar can be fabricated and handled just like conventional steel rebar. Standard fabrication equipment can be used. There are no special handling requirements in contrast to epoxy-coated, galvanized, stainless steel or even Z-Bar steel bars. Learn more HERE.

How does ChromX® look when it arrives at the fabricator?

Similar to conventional steel, ChromX® rebar is rolled, bundled and tagged.

Does ChromX® have standard mill marks to distinguish from standard black bar?

Yes. To distinguish ChromX® rebar from other steel rebar, it is marked with the following series of letters and numbers. Figures 1, 2 and 3 illustrate the markings on ASTM A1035-15 Types CS, CM and CL steel reinforcing bars respectively.

Bar identifier “CRX” for ChromX®:

  1. Product designation “9”, “4” and “2” for ChromX® 9000, 4000 and 2000, respectively;
  2. Point of origin – letter or symbol established as the manufacturer’s mill designation 
  3. Size designation – number corresponding to ASTM inch-pound bar designation number (e.g. “5” for #5 bar) or metric measurement (e.g. “16” for 16 mm bar);
  4. Type of steel – letters indicating that the bar was produced to ASTM A1035 and AASHTO M 334M/M 334 specification (e.g. “CS”, “CM” and “CL” for ChromX® 9000, 4000 and 2000, respectively); 
  5. Minimum Yield / Grade Designation number corresponding to bar minimum yield strength / strength grade (e.g. “100” for 100 KSI or “690” for 690 MPa yield strengths).
ChromX9100_BarMarks.png

ChromX4100_BarMarks.png

ChromX2100_BarMarks.png

Will ChromX® rust?

ChromX® steel rebar will rust; however, the high chloride threshold and slow corrosion rates prolong the life of the rebar and the concrete structure reinforced by it, providing extended service life in concrete.

Mill scale on the surface of the bar will rust with shallow pitting if exposed to the environment, but the rusting of the mill scale should not result in deep pitting or severe corrosion of the bar deformations. Mill scale oxidation generally has no effect on the performance of the rebar and is not considered a cause for rejection under ASTM, AASHTO, ACI or CRSI standards.

Why is there rust on the rebar delivered? Is it acceptable?

ChromX® bars are delivered “as rolled” from the mill and may have “mill scale” on the surface of the bars. The mill scale can rust when exposed to water, air moisture or other corrosive elements, resulting in surface rust on the bar. Mill scale oxidation generally has no effect on the performance of the rebar and is not considered a cause for rejection under ASTM, AASHTO, ACI or CRSI standards.

Can ChromX® rebar be cut in the field? Is there a protocol or a procedure?

ChromX® rebar can be cut in the field using conventional equipment, but torch cutting is prohibited because heat adversely impacts the high strength and the high corrosion resistant properties of ChromX® steel reinforcing bars.

Can ChromX® be used in contact or close proximity to other materials?

Several studies have reported that there is no added risk of combining conventional steel products, such as rebar, couplers, wires, etc., to ChromX® products in concrete. Learn more HERE.

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