Rebar
Deformed reinforcing bar for reinforced concrete structures: GOST 34028 and GOST 5781 for construction sites in Uzbekistan, GB/T 1499.2 as rolled by mills in China, ASTM A615 for export projects.
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items with size and weight tables
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standards for rolling and acceptance
Items in this category
A500C, A400, HRB400E, HRB500E, ASTM Grade 60 · Ø6–57 mm · from mills in China
What it is and how it is supplied
Rebar is a hot-rolled or thermomechanically strengthened deformed bar that carries tension in concrete. The grade is set by yield strength: A400 from 390 N/mm² under GOST 5781 and from 400 N/mm² under GOST 34028, A500C and HRB500 from 500 N/mm², ASTM Grade 60 from 420 N/mm². Surface ribs provide bond with concrete; their shape and spacing are specified by the standard and differ between GOST, GB and ASTM.
Details
Mills in China roll rebar to GB/T 1499.2-2018 from microalloyed steel with vanadium or niobium; the E suffix denotes the seismic version with a check of the tensile-to-yield ratio and the total elongation at maximum force. For GOST projects the same mills produce A500C and A400 to GOST 34028-2016 and GOST 5781-82 with a mill test certificate to those standards. Grade correspondence between standards is by yield strength; chemical composition, weldability and rib profile differ between equivalents, so any change of grade is agreed with the structural designer.
The bureau works with the mill under a contract: the project specification is converted into an order stating the standard, grade, diameters, lengths and certificate requirements. Before shipment the bureau's inspector at the mill checks the batch against the order — diameters, rib profile, marking, heat numbers on the certificate and on the tags, packing — and draws up an inspection report with photographs. The batch is sized to your volume — send your specification.
Grade equivalents
Equivalents are the nearest, not identical: the exact grade and standard are written into the contract.
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| A240 (GOST 34028), A-I (GOST 5781) | GB (China)HPB300 (GB/T 1499.1) | ASTMGrade 40 [280] | EN— | NotePlain round bar. Yield strengths differ: 240, 300 and 280 N/mm². |
| A400 (GOST 34028) | GB (China)HRB400 / HRB400E | ASTMGrade 60 [420] | EN— | NoteNearest equivalents by yield strength of 400–420 N/mm². Grade 60 under ASTM A615 is not intended for welding. |
| A-III / A400 (GOST 5781, 25G2S, 35GS) | GB (China)HRB400 / HRB400E | ASTMGrade 60 [420] | EN— | NoteNearest equivalent. Steel 35GS has limited weldability; HRB400 is rolled from microalloyed steel with a carbon equivalent of up to 0.54 %. The GOST 5781 rib pattern is herringbone, the GB pattern is crescent. |
| A500C (GOST 34028) | GB (China)HRB500 / HRB500E | ASTMGrade 75 [520] | ENB500B | NoteB500B (BS 4449, DIN 488 within EN 10080) is the equivalent by yield strength of 500 N/mm²; HRB500E and Grade 75 are the nearest equivalents. A500C is weldable, carbon equivalent up to 0.52 %. |
| A500C (GOST 34028) | GB (China)HRB400E | ASTMGrade 60 [420] | ENB500B | NoteReplacing A500C with HRB400E lowers the design strength and requires the reinforcement to be recalculated — only with the structural designer's approval. |
| A600 (GOST 34028) | GB (China)HRB600 | ASTMGrade 80 [550] | EN— | NoteNearest equivalents: yield strength 600, 600 and 550 N/mm². |
Equivalents are the closest match, not identical: chemistry and tolerances differ between standards. The exact grade and standard are written into the contract.
Buyer questions
How to read a mill test certificate (MTC) for rebar
The certificate states the standard and grade, diameter, heat number, chemical composition of the heat with the carbon equivalent, tensile test results (yield strength, tensile strength, elongation) and bend test results, weight and number of bundles. The heat number on the certificate is checked against the tag on every bundle and the rolled-in marking on the bar — this is the link between the document and the metal. The bureau's inspector makes this check at the mill before shipment and attaches the certificate to the inspection report.
How A500C differs from A400 (A-III) and from HRB400E
By yield strength and by how the strength is obtained. A400 under GOST 5781 is hot-rolled from low-alloy steel 25G2S or 35GS, yield strength from 390 N/mm², herringbone rib pattern. A500C under GOST 34028 is as a rule thermomechanically strengthened low-carbon steel, yield strength from 500 N/mm², weldable, crescent rib pattern. HRB400E under GB/T 1499.2 is hot-rolled microalloyed steel, yield strength from 400 N/mm², with seismic ductility requirements. The grade for a project is set by the structural designer; the bureau selects a mill for the specified grade.
How the tonnage of a batch is calculated
A specification in metres is converted to tonnes by theoretical weight: the weight per metre equals 0.006165·d², where d is the nominal diameter in millimetres. The weight tables on the product pages are built on this formula at a steel density of 7.85 g/cm³. Shipment and acceptance are by actual weight as recorded on the mill's certificate and packing list; the deviation of actual weight from theoretical is limited by the tolerance of the standard.
What the bureau's inspector checks at the mill before shipment
That the batch matches the order by standard, grade and diameters; nominal diameter and rib height with a calliper and a micrometer, the weight of a one-metre sample on scales; the rolled-in marking on the bar and the tag on the bundle — grade, diameter, heat, mill; the mill test certificate for every heat; packing and strapping of bundles. The result is an inspection report with photographs. Rejects recorded in the report are replaced — the replacement is supplied by the mill under its contract with the bureau.
What the minimum batch is and whether several diameters can be combined in one shipment
The batch is sized to your volume — send a specification with grade, diameters, lengths and quantity for each item. Several diameters of one grade are collected at one mill into one shipment; where standards or grades differ, the bureau selects a mill that rolls all the required items or consolidates the shipment from two mills.
Price request
Send your specification and we will quote your batch
Price depends on grade, size, tonnage and delivery terms on the day of contract.
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