Knowledge

Grade, document, weight

Chinese mills roll to GB, projects in Uzbekistan are designed to GOST, export certificates are written to ASTM and EN. Twelve articles on what matches, what does not, and what to write into the contract so that acceptance goes by the documents.

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Standards and grades

Where GOST, GB, ASTM and EN agree on the numbers, where they do not, and how to write a pair of grades into the contract.

GOST 34028-2016 · GB/T 1499.2-2018 · updated 17.09.2026 Which rebar you need: our A500C and Chinese HRB The specification says A500C to GOST 34028-2016, the Chinese mill rolls to GB/T 1499.2-2018. Which of the two 500-grades to write into the contract, and why HRB400E does not replace A500C without recalculation.

GOST 380-2005 · GOST 14637-89 · GB/T 700-2006 · EN 10025-2:2019 · ASTM A36/A36M · updated 17.09.2026 Ordinary structural steel under four names General structural steel in four standards. Where the numbers coincide, where they differ by tenths, and why the “sp” in GOST and the “B” in GB answer for different things.

GOST 19281-2014 · GB/T 1591-2018 · EN 10025-2:2019 · ASTM A572/A572M · updated 17.09.2026 Which plate to take for load-bearing structures Q345B disappeared from GB/T 1591 in 2018 but lives on in old certificates. How Q355B differs from 09G2S in numbers, where their test temperatures part ways, and what to write into the contract when the structure works in frost.

Rectangular tube: how to write the size in a specification

GOST 8639-82 · GOST 8645-68 · GOST 30245-2003 · GB/T 6728-2017 · EN 10219-1 · ASTM A500/A500M · updated 17.09.2026 Rectangular tube: how to write the size in a specification Square to GOST 8639, rectangular to GOST 8645, both to GB/T 6728. How to write the size so that the mill understands it, where the 2.86 in the mass formula comes from, and why the steel grade for a section carries the letter H when the standard is EN.

GOST 10704-91 · GOST 8732-78 · GB/T 3091-2015 · GB/T 8163-2018 · ASTM A53/A53M · ASTM A106/A106M · updated 17.09.2026 Welded or seamless pipe: which to choose Both pipes come in the same diameter, the same wall and the same grade, yet they cost and work differently. The standards for both in four systems, where a weld is acceptable and where it is not, and why A53 and A106 with identical mechanics are different pipes.

EN 10346:2015 · GB/T 2518-2019 · GOST 14918-2020 · ASTM A653/A653M · updated 17.09.2026 Galvanized sheet: how to read the zinc coating DX51D describes the steel under the coating, Z275 the zinc itself, and the specification must carry both. What each letter means under EN 10346, how grams per square metre turn into microns per side, and where Z120 exists and where it does not.

Documents and control

Mill certificate, inspection report, contract: what backs a batch from the mill and what a batch from the market lacks.

EN 10204:2004 · GB/T 18253 · GOST 7566-2018 · updated 17.09.2026 How to read a mill test certificate The mill test certificate is the only document that links a bundle in the warehouse to a heat in the furnace. Which fields it must contain, what the “3.1” in the corner means, and why 3.1 and 3.2 are not interchangeable in either direction.

GOST 34028-2016 · GB/T 1499.2-2018 · GOST 19903-2015 · GB/T 709-2019 · updated 17.09.2026 What is checked at the mill before shipment The certificate says which steel was melted. The inspection report says which steel lies in the bundles that will travel to you. The fields of the report, the measurements by product type, the photographs attached to it, and what happens when something does not match.

GOST 7566-2018 · EN 10204:2004 · updated 17.09.2026 Mill or market: how the supply differs At the market the steel is there today; from the mill it comes as a batch to a specification. The difference is not in speed or in price per tonne, but in what is known about the steel and who answers if it is not what was ordered.

Weight and logistics

How metres become tonnes, tonnes become wagons and containers, and a batch crosses the border with a complete set of papers.

GOST 34028-2016 · GB/T 1499.2-2018 · updated 17.09.2026 How many rebar bars are in a tonne The specification is counted in tonnes, the warehouse counts bundles in bars, the project counts metres. One formula links the three units, and the table below is its result for every diameter from 6 to 40 mm.

GOST 19903-2015 · GOST 19904-90 · GB/T 709-2019 · GB/T 708-2019 · updated 17.09.2026 How much a plate and a coil weigh Plate is counted from the square metre, coil from the running metre of strip or from two diameters. Formulas, tables for the common 1 500×6 000 and 1 250×2 500 formats, and how the mass at the lower thickness tolerance differs from the mass at nominal.

SMGS · TN VED 72, 73 · updated 17.09.2026 How steel travels from China to Uzbekistan A batch crosses two borders and one change of gauge. Which steel travels by container, which by open wagon, where it is transshipped, what papers are needed at each node, and why no transit times are named in this article.

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