Q235B · St3sp · 1.5–12 mm · width 1 000–2 000 · GOST 19903
Hot-rolled coil
Hot-rolled coil in Q235B, St3sp and 09G2S, 1.5–12 mm thick, for cutting, slit strip, roll-formed profiles and welded tube
St3sp · Q235B · DC01 · 0.5–6 mm · width 20–630 · GOST 6009
Slit strip
Strip slit lengthwise from coil, 20–630 mm wide and 0.5–6 mm thick, for electric-welded tube, profiles and banding
GOST 6009-74GOST 503-81GOST 19903-2015GOST 19904-90GB/T 3524-2015GB/T 716-1991EN 10048:1996EN 10051:2010ASTM A1011/A1011MSt3spSt3psQ235BQ19509G2S08psDC01DX51D+Z
Parameters
| Parameters | |
|---|---|
| Thickness | 1.5–6 mm from hot-rolled coil; 0.5–3 mm from cold-rolled coil |
| Width | 20–630 mm to specification, in 1 mm steps |
| Steel grade | St3sp, St3ps, Q235B, Q195, 09G2S, 08ps, DC01, DX51D+Z |
| Surface | black, pickled and oiled, cold-rolled, galvanized |
| Edge | cut; burr height per the standard |
| Coil inside diameter | 508 or 610 mm; 762 mm for hot-rolled |
| Coil weight | to specification for your decoiler |
Sizes and weight
| Size, mm | Weight, kg/m |
|---|---|
| 50×1.5 | 0.589 |
| 60×2 | 0.942 |
| 80×2 | 1.26 |
| 100×2 | 1.57 |
| 120×2.5 | 2.36 |
| 150×3 | 3.53 |
| 170×3 | 4 |
| 200×3 | 4.71 |
| 250×3 | 5.89 |
| 300×4 | 9.42 |
| 400×4 | 12.6 |
| 500×5 | 19.6 |
| 600×6 | 28.3 |
Theoretical weight at steel density 7.85 g/cm³. Actual batch weight is by scale and mill certificate.
Description
Slit strip is narrow strip produced by slitting a wide coil lengthwise with circular knives on a slitting line; each strip is wound into a separate coil. The parent coil is hot-rolled (St3sp, St3ps, Q235B, 09G2S, Q355B), cold-rolled (08ps, DC01, SPCC) or galvanized (DX51D+Z): the slit strip inherits the grade, thickness and mill test certificate of the parent coil, while the width is set to suit the workpiece. For electric-welded tube the strip width is calculated from the mean diameter, π·(D − t), with an allowance for reduction and sizing, so it is specified to the millimetre.
The difference between slit strip from hot-rolled and from cold-rolled coil is the same as between the coils: thickness from 1.5 mm with scale or a pickled surface in the first case, 0.5–3 mm with a smooth oiled surface in the second. The slit edge is specified separately: burr height, camber (deviation from straightness along the length) and width tolerance — to GOST 6009 for hot-rolled strip, GOST 503 for cold-rolled, EN 10048 and EN 10051 for export batches. Mills in China slit strip to GB/T 3524 and GB/T 716.
Inspection at the mill before shipment: width with callipers on several wraps of each coil, thickness with a micrometer at the edges and in the middle of the strip, burr height, camber on an unwound length, tightness of winding and telescoping, surface condition. The mill test certificate (MTC) is checked against the heat number of the parent coil on the tag: grade, chemical composition, mechanical properties. Marking of each strip coil, stacking on the pallet, strapping and moisture protection are checked.
Applications
- feedstock for electric-welded round and hollow section tube
- roll-formed profiles: track, stud, zed and sigma
- banding for packing, strapping and reinforcement
- cable trays and perforated profiles
- racking systems and shelving
- galvanized slit strip for downpipes and drywall profiles
Packing and shipment
Slit strip coils are stacked on a pallet eye-up or horizontally, strapped with steel band to each other and to the pallet, and wrapped in moisture-proof film; a tag on each coil with the parent coil heat number, grade, thickness, width and weight.
Grade equivalents
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| St3sp | Q235B | A1011 CS Type B / A36 | S235JR | Correspondence by mechanical properties; the chemical composition and impact toughness requirements differ between the standards — check against the MTC. |
| 09G2S | Q355B (Q345B) | A572 Grade 50 | S355JR | Nearest analogue: yield strength is comparable, but 09G2S carries more manganese and silicon alloying. |
| 08ps | DC01 / SPCC | A1008 CS Type B | DC01 | Cold-rolled low-carbon steel for general use; deep drawing calls for DC03–DC04 or 08Yu. |
| 08ps ZN (GOST 14918) | DX51D+Z | A653 CS Type B | DX51D+Z | Galvanized base for bending and roll forming; the zinc class is specified separately (Z100–Z275). |
| 250 / 350 (GOST 14918) | S250GD+Z / S350GD+Z | A653 SS Grade 37 / 50 | S250GD+Z / S350GD+Z | Structural galvanized grades with a specified yield strength; ASTM SS is the nearest analogue by strength. |
| 08Kh18N10 | 06Cr19Ni10 | 304 | 1.4301 | Austenitic chromium-nickel steel; the GOST grade allows a higher carbon content than 304L. |
| 03Kh17N14M3 | 022Cr17Ni12Mo2 | 316L | 1.4404 | Molybdenum-bearing low-carbon austenitic steel; close correspondence. |
| 12Kh17G9AN4 | 12Cr17Mn6Ni5N | 201 | 1.4372 | Nearest analogue: chromium-manganese steel with nitrogen, nickel partly replaced by manganese; corrosion resistance is lower than that of 304. |
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
DC01 · 08ps · SPCC · 0.4–3 mm · width 1 000–1 500 · GOST 19904
Cold-rolled coil
Cold-rolled annealed coil in DC01, 08ps and SPCC, 0.4–3 mm thick, for pressing, painting and galvanizing
DX51D+Z · Z100–Z275 · 0.3–3 mm · width 1 000–1 500 · GOST 14918
Galvanized coil
Hot-dip galvanized coil DX51D+Z with zinc weight Z100–Z275, 0.3–3 mm thick, for profiled sheeting, ventilation and profiles
Buyer questions
How to read a mill test certificate (MTC) for coil
Four blocks in the certificate must agree: the heat number and coil number with the tag on the coil; the grade and standard with the specification; the chemical composition with the limits of the standard for that grade; the mechanical properties (yield strength, tensile strength, elongation) with the values required by the standard. For galvanized coil the zinc coating weight is added, for colour-coated coil the type and thickness of the paint layer. The bureau checks the MTC against the heat at the mill before shipment and hands over the original with the batch.
How hot-rolled coil differs from cold-rolled
Hot-rolled coil is rolled above the recrystallisation temperature: thickness from 1.5 mm, surface with mill scale, wider thickness tolerance. Cold-rolled coil is made from hot-rolled by pickling and cold reduction followed by annealing: thickness from 0.3 mm, smooth surface, tighter tolerance, and the steel is more ductile after annealing. Welded tube, profiles and structures take hot-rolled; pressing, body panels, galvanizing and painting take cold-rolled.
How coil tonnage is calculated
The theoretical weight of one square metre is 7.85 kg per millimetre of thickness; the coil weight is the strip area multiplied by that figure. Shipment and payment go by the actual weight from weighing, recorded in the certificate and on the tag; the difference from the theoretical weight comes from the thickness tolerance. The specification states tonnes, not the number of coils, and separately the maximum weight of one coil and the inside diameter to suit your decoiler.
What the bureau inspector checks at the mill before shipment
Thickness with a micrometer on the outer wrap at several points across the width and on the coil end face; width with a tape; telescoping and tightness of winding; condition of the edge and surface; the heat number on the tag against the MTC; for galvanized coil the uniformity of the coating and absence of bare spots, for stainless coil the grade with a positive material identification (PMI) analyser; packing and strapping. 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.
How the batch is sized
The batch is sized to your volume — send your specification: grade and standard, thickness with tolerance, width, surface condition, for coated coil the zinc class and polymer type with the RAL colour, plus the inside diameter and maximum weight of a coil. Mills roll coil to order by width and thickness, so the more precise the specification, the fewer approvals are needed. The bureau selects a mill for that specification and returns confirmed delivery terms.
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.
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