St3sp/ps · Q235B · t 1.5–100 · 1 500×6 000 · GOST 19903
Hot-rolled plate St3
Hot-rolled plate of ordinary-quality carbon steel for steel structures, tanks and machine building
St3 · Q235B · teardrop / diamond · t 2.5–12 · 1 500×6 000 · GOST 8568
Chequered plate
Hot-rolled plate with lentil or diamond pattern for platforms, stair treads and floors with a non-slip surface
GOST 8568-77GOST 380-2005GB/T 33974-2017ASTM A786/A786MEN 10363St3spSt3psQ235BS235JR
Parameters
| Parameters | |
|---|---|
| Base thickness | 2.5; 3; 4; 5; 6; 8; 10; 12 mm |
| Pattern | teardrop or diamond |
| Width | 1 000, 1 250, 1 500 mm |
| Length | 2 000–6 000 mm; fixed length — to specification |
| Steel grade | St3sp, St3ps; Q235B |
| Surface | hot-rolled; hot-dip galvanizing of the finished sheet — to specification |
Sizes and weight
| t, mm | Weight, kg/m² | Sheet 1 500×6 000, kg |
|---|---|---|
| 2.5 | 19.6 | 176.6 |
| 3 | 23.5 | 212 |
| 4 | 31.4 | 282.6 |
| 5 | 39.3 | 353.3 |
| 6 | 47.1 | 423.9 |
| 8 | 62.8 | 565.2 |
| 10 | 78.5 | 706.5 |
| 12 | 94.2 | 847.8 |
Theoretical weight at steel density 7.85 g/cm³. Actual batch weight is by scale and mill certificate.
Description
Chequered plate is hot-rolled carbon steel plate with a raised pattern rolled into the face side in the last stand of the mill. To GOST 8568-77 the pattern is lentil — oval ribs set at an angle to one another — or diamond. In China the plate is rolled to GB/T 33974-2017, export batches to ASTM A786/A786M and EN 10363. The ribs give grip to footwear and wheels and raise the bending stiffness of the plate at the same base thickness.
The base steel is St3sp or St3ps to GOST 380-2005, at mills in China Q235B, for export S235JR. Thickness to GOST 8568 is taken on the plate base without the pattern height: 2.5; 3; 4; 5; 6; 8; 10; 12 mm. The weight of chequered plate exceeds that of plain plate of the same thickness by the weight of the ribs — the calculated table below gives the weight of the plain base, while the weight with the pattern is taken from the table of the standard and the mill certificate. The lentil pattern is more often chosen for stair treads and platforms, the diamond pattern for floors and vehicle bodies.
At the mill before shipment the bureau's inspector measures the base thickness with a micrometer between the ribs and the pattern height with a calliper, checks them against GOST 8568 or GB/T 33974, checks the format, squareness of cut and flatness, and examines the pattern for unrolled areas, crushed ribs, laminations and tears. The mill test certificate (MTC) is checked against the bundle tag by heat number, the composition against the grade limits. Packaging is checked. The report with photographs is handed to you before shipment.
Applications
- service platforms and walkways
- stair treads and flights in industrial buildings
- floors of workshops, warehouses and ramps
- floors of vehicle bodies, trailers and platforms
- gangways and decking of trestles
- decking on ships and pontoons
Packing and shipment
Bundles on timber bearers, strapped with steel band; paint marking and mill tag with grade, heat, thickness and pattern type.
Grade equivalents
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| St3sp / St3ps | Q235B | A36 | S235JR | Nearest equivalents. Q235B and S235JR specify impact toughness at +20 °C, GOST 14637 by category; A36 has a higher yield strength, 250 MPa. |
| 09G2S | Q355B (Q345B before 2018) | A572 Grade 50 | S355JR / S355J2 | Nearest equivalents by strength. The 09G2S category for impact toughness at −40 or −70 °C is specified separately; Q355B is tested at +20 °C. |
| 08ps | DC01 | A1008 CS Type B | DC01 | SPCC to JIS G3141 is the same class of general-purpose cold-rolled low-carbon steel. |
| 08ps to GOST 14918 | DX51D+Z | A653 CS Type B | DX51D+Z | The 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 | TDC51D+Z | A755 based on A653 | DX51D+Z to EN 10169 | The 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 | 06Cr19Ni10 | 304 | 1.4301 (X5CrNi18-10) | 12Kh18N10T is the equivalent of titanium-stabilised grade 321, not of 304. |
| 03Kh18N11 | 022Cr19Ni10 | 304L | 1.4307 (X2CrNi18-9) | Low-carbon version of 304 (carbon up to 0.03 %) for welded structures without subsequent heat treatment. |
| 03Kh17N14M3 | 022Cr17Ni12Mo2 | 316L | 1.4404 (X2CrNiMo17-12-2) | Molybdenum 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.
Related items
09G2S · Q355B · t 2–50 · 1 500×6 000 · GOST 19281
Plate 09G2S
Low-alloy hot-rolled plate of increased strength for structures operating at low temperatures
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
Steel pricing depends on grade, size, tonnage and delivery terms on the day of contract. A number on the page would be wrong by the time you read it.
Request received