Sheet and plate
Sheet and plate are flat-rolled steel products cut to length: from hot-rolled heavy plate for structures to cold-rolled, galvanized and stainless sheet for machine building, ventilation, food and chemical equipment.
8
items with size and weight tables
24
standards for rolling and acceptance
Items in this category
Hot-rolled, cold-rolled, galvanized, pre-painted, chequered, stainless
What it is and how it is supplied
Sheet and plate are classified by the production route and by the surface finish. Hot-rolled plate is rolled from a slab above the recrystallisation temperature: it goes into steel structures, tanks and machine building and serves as the base for chequered plate. Cold-rolled sheet is produced from hot-rolled coil after pickling and rolling in the cold state — its thickness is held to a tighter tolerance and its surface is cleaner, so it goes into stamping, painting and enamelling. Galvanized sheet and pre-painted sheet are a cold-rolled base with a protective layer applied on a continuous line. Stainless sheet is a separate group by chemical composition: chromium-nickel steels 304 and 316L.
Details
For Uzbekistan the base standard is GOST: dimensions of hot-rolled plate to GOST 19903-2015, of cold-rolled sheet to GOST 19904-90, technical requirements to GOST 14637-89, GOST 16523-97 and GOST 19281-2014. Mills in China roll to GB/T 3274-2017, GB/T 708-2019, GB/T 2518-2019 and GB/T 12754-2019, export batches to ASTM and EN. Grades in these systems are not identical: St3sp, Q235B and S235JR are close in yield strength but differ in impact toughness requirements and deoxidation. In the specification the bureau fixes the grade and the standard against which the mill issues the certificate, and lists the nearest equivalents as equivalents, not as identity.
Inspection of sheet at the mill before shipment follows one procedure for every item in the category: thickness measured with a micrometer at several points of the sheet and checked against the tolerance of the standard, width and length measured with a tape, flatness and squareness of cut checked, surface examined for laminations, laps, tears and rolled-in scale, marking and tags checked against the mill test certificate (MTC) by heat number and chemical composition, packaging checked. For coated products the zinc or polymer layer is measured with a coating gauge; for stainless steel the composition is verified with a portable analyser. The inspection report with photographs is handed to you before shipment; defects recorded in the report are replaced — the replacement is supplied by the producing mill under its contract with the bureau.
Grade equivalents
Equivalents are the nearest, not identical: the exact grade and standard are written into the contract.
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| St3sp / St3ps | GB (China)Q235B | ASTMA36 | ENS235JR | NoteNearest equivalents. Q235B and S235JR specify impact toughness at +20 °C, GOST 14637 by category; A36 has a higher yield strength, 250 MPa. |
| 09G2S | GB (China)Q355B (Q345B before 2018) | ASTMA572 Grade 50 | ENS355JR / S355J2 | NoteNearest equivalents by strength. The 09G2S category for impact toughness at −40 or −70 °C is specified separately; Q355B is tested at +20 °C. |
| 08ps | GB (China)DC01 | ASTMA1008 CS Type B | ENDC01 | NoteSPCC to JIS G3141 is the same class of general-purpose cold-rolled low-carbon steel. |
| 08ps to GOST 14918 | GB (China)DX51D+Z | ASTMA653 CS Type B | ENDX51D+Z | NoteThe DX51D+Z designation in GB/T 2518 matches EN 10346. Zinc coating weight (Z100–Z275) is specified separately from the grade. |
| GOST 34180 based on 08ps | GB (China)TDC51D+Z | ASTMA755 based on A653 | ENDX51D+Z to EN 10169 | NoteThe grade describes the steel substrate and the zinc. Type and thickness of the polymer layer, RAL colour and environment class are set by the specification. |
| 08Kh18N10 | GB (China)06Cr19Ni10 | ASTM304 | EN1.4301 (X5CrNi18-10) | Note12Kh18N10T is the equivalent of titanium-stabilised grade 321, not of 304. |
| 03Kh18N11 | GB (China)022Cr19Ni10 | ASTM304L | EN1.4307 (X2CrNi18-9) | NoteLow-carbon version of 304 (carbon up to 0.03 %) for welded structures without subsequent heat treatment. |
| 03Kh17N14M3 | GB (China)022Cr17Ni12Mo2 | ASTM316L | EN1.4404 (X2CrNiMo17-12-2) | NoteMolybdenum 2–3 % to ASTM A240. Mills in China certify to ASTM or EN; the GOST grade is entered in the MTC on request as an equivalent. |
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 for sheet
In the certificate (MTC) the mill states the standard and grade, heat number, thickness and format, chemical composition of the heat, mechanical test results and batch number. We check the heat number against the tag on every bundle and the marking on the sheets, and the composition and properties against the requirements of the standard named in the specification. A certificate without a heat number, or with a composition outside the limits of the standard, is grounds for not accepting the batch.
How St3sp differs from St3ps and from Q235B
St3sp is killed steel, fully deoxidised; St3ps is semi-killed. For welded structures and service at sub-zero temperatures St3sp with a category to GOST 14637 is usually specified. Q235B is the Chinese grade of the same class with a yield strength of 235 MPa minimum and an impact test at +20 °C. A mill in China issues the certificate to GB/T 700 or, under contract, rolls the plate to GOST requirements and states this in the MTC.
How sheet tonnage is calculated
Theoretical weight per square metre is 7.85 kg for every millimetre of thickness; the weight of a sheet is thickness multiplied by area and by 7.85. Actual weight differs because of the thickness tolerance: a minus tolerance makes the batch lighter than theoretical. In the specification we fix which weight the batch is settled by — theoretical or actual by weighing at the mill — and the same weight goes into the packing list.
What is checked during inspection at the mill
Thickness with a micrometer at several points of every sample sheet, width and length with a tape, flatness and squareness of cut, surface for laminations, laps and scale, marking and tags, certificate by heat and composition, packaging. For coated products — zinc or polymer thickness with a coating gauge; for stainless steel — a composition check with a portable analyser. The result is a report with photographs before shipment.
How a batch is calculated
The batch is calculated for your volume — send the specification: grade and standard, thickness, sheet format, coating and surface, quantity in sheets or tonnes, certificate requirements. From the specification we find a producing mill, agree the rolling and packaging terms and reply with a calculation.
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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