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Medium & Heavy Thickness Steel Plates
Medium & Heavy Thickness Steel Plates
Medium & Heavy Thickness Steel Plates | Global Sourcing for Engineering & Procurement
1. Overview & Supply Scope
• Definition: Hot-rolled or heat-treated steel plates, typical thickness 6–300 mm, width 1,500–4,500 mm, length 6–24 m. Delivery conditions include TMCP, Normalized (N), Normalized Rolled (NR), Quenched & Tempered (Q+T), and Solution Annealed (for stainless).
• Families: C-Mn and HSLA, pressure-vessel/boiler, Cr-Mo creep-resistant, low-temperature Ni steels, offshore/shipbuilding, line-pipe skelp plates, bridge/building structural, weathering, abrasion-resistant, stainless and duplex.
• Sectors: Petrochem, pipelines & offshore, pressure equipment & boilers, power & energy storage, LNG/cryogenic, marine, bridges & buildings, wind and heavy structures, mining & machinery, food/pharma, environmental.
2. Quick Mapping: Application → Material → Standard → Size
1. Pressure vessels & boilers
• Materials: ASME SA-516 (Gr.60/65/70), SA-537 (Cl.1/Cl.2), SA-387 (Gr.11/12/22/5/9/91); EN 10028-2 (16Mo3, 13CrMo4-5, 10CrMo9-10), EN 10028-3 (P275N/P355N/P355NL1/NL2), EN 10028-5 (TMCP fine-grain), EN 10028-6 (Q+T fine-grain); China GB/T 713 (Q345R/Q370R/20R) and Cr-Mo vessel grades.
• Standards: ASME SA-20 (general requirements), EN 10028-1 (general), optional CE/PED compliance.
• Sizes/tests: 8–200 mm typical; UT per ASTM A578 (A/B/C) or EN 10160 (S/E classes); impact as per drawing.
2. Cryogenic & LNG
• Materials: A/SA-203 (Ni 3.5–8%), A/SA-353 (9%Ni DN+T), A/SA-553 (Type I/II 8–9%Ni), EN 10028-4 (X8Ni9), GB 3531 (3.5Ni/5Ni/9Ni).
• Notes: Impact at −196 °C; CTOD (ISO 15653 or BS 7448) if required.
• Sizes/tests: 6–80 mm typical; 100% UT; weldability controlled by Pcm/Ceq.
3. Line-pipe skelp plates (for LSAW/UOE pipe making)
• Materials: API 5L PSL2/PSL3 (X52–X80 and above), ISO 3183, GB/T 9711 (L360–L555).
• Notes: DWTT, HIC (NACE TM0284), SSC (NACE TM0177) as specified; through-thickness properties optional.
• Sizes/tests: 12–50 mm typical, width 2,000–4,300 mm; TMCP or Q+T; UT class and lamellar-tearing resistance per PO.
4. Offshore structures & wind towers
• Materials: EN 10225 (S355G8/G10 M/ML, S420G2 M/ML), API 2W/2H (Grade 50/60/65), DNV offshore grades; wind towers use EN 10025-3/-4 (S355M/ML, S420M/ML, S460M/ML) or GB/T 1591 (Q355D/E, Q420D/E, Q460D/E).
• Notes: EN 10164 Z15/Z25/Z35 or ASTM A770; impact down to −40 °C; coating and Sa 2.5 blasting as required.
5. Shipbuilding & marine
• Materials: A/SA-131 (A/B/AH36/DH36/EH36/EH40), GB 712; supply under ABS/LR/DNV/BV/CCS rules as needed.
• Sizes/tests: 8–80 mm typical; impact and Z-direction per class/drawings.
6. Bridges & buildings
• Materials: ASTM A36, A572 (Gr.50/55/65), A709 (Gr.50/50W/HPS 70W); EN 10025-2 (S235/S275/S355), EN 10025-6 (S690Q/S890Q/S960Q); GB/T 1591 (Q355/Q390/Q420/Q460).
• Weathering options: ASTM A588, EN 10025-5, GB/T 4171.
7. Abrasion-resistant & weathering
• AR: GB/T 24186 (NM360/400/450/500/600); international AR grades (AR400/450/500) supplied to mill specs.
• Weathering: ASTM A588/A242, EN 10025-5, GB/T 4171.
8. Stainless & duplex plates
• Materials: ASTM A240 (304/304L, 316/316L, 321, 347, 904L, N08904, S31254), duplex 2205 (S32205), super duplex 2507 (S32750/S32760); EN 10088-2; JIS G4304.
• Condition/surface: HRAP/No.1; passivation per ASTM A967 if required.
9. High-strength structural & Cr-Mo heat-resistant
• High-strength: ASTM A514 (Q+T), EN 10025-6 (S690Q/S890Q/S960Q), GB/T 16270 (Q690/Q890/Q960).
• Heat-resistant: SA-387 (Cr-Mo series) for hot-service pressure parts.
10. Nuclear & critical pressure equipment (project-specific)
• Materials: ASME SA-533 (Mn-Mo-Ni, Class 1/2), SA-537 (Cl.1/2); supply per RCC-M if specified.
• Notes: full traceability, stringent UT, specified impact and fracture properties.
3. Specs, Tolerances & Inspection
• Dimensions: thickness 6–300 mm (typical 6–150 mm), width 1,500–4,500 mm, length 6–24 m.
• Tolerances: ASTM A6/A6M, EN 10029 (thickness class A/B, flatness normal/special), ISO 7452.
• Surface & edges: EN 10163-2; optional shot-blast & shop-primer (Sa 2.5).
• UT: ASTM A578 (Levels A/B/C) or EN 10160 (S/E classes).
• Through-thickness: EN 10164 (Z15/Z25/Z35) or ASTM A770.
• Toughness & fracture: CVN per PO; DWTT/CTOD for pipeline/offshore as required.
• HIC/SSC: NACE TM0284/TM0177; chemistry limits (Pcm/Ceq) if required.
4. Manufacturing & QA
• Steelmaking: BOF/EAF + LF/VD/VOD/AOD; Ca-treatment and clean-steel control; controlled rolling/cooling or heat treatment to target microstructure.
• Delivery: TMCP, N, NR, Q+T, Solution Annealed (stainless).
• QA backbone: chemistry, tensile, impact, hardness, metallography; UT, Z-direction, HIC/SSC, DWTT/CTOD per spec; EN 10204 3.1/3.2; third-party witnessing on request.
5. RFQ Checklist (copy-ready)
1. Standard & edition (e.g., ASME SA-516-2023, EN 10028-3:2017, EN 10025-6:2019, API 5L PSL2).
2. Grade & delivery condition (e.g., SA-516 Gr.70 N, P355NL2, S460ML (TMCP), S690Q (Q+T), A240 316L (Solution Annealed)).
3. Size: thickness × width × length; exact or multiple length; mill-edge or trimmed.
4. Tolerance/flatness: per ASTM A6/EN 10029; flatness class (normal/special).
5. UT class: ASTM A578 Level B or EN 10160 S2/E2.
6. Z-direction: EN 10164 Z25/Z35 (if required).
7. Toughness & fracture: CVN temp/energy; DWTT/CTOD if required.
8. HIC/SSC & weldability: HIC/SSC tests; hardness and Pcm/Ceq caps (if required).
9. Surface/coating: blast grade, primer system and DFT (if required).
10. Documentation: EN 10204 3.1/3.2, TPI scope, CE/PED or class approvals as needed.
6. Packing & Delivery
• Protection & marking: corner guards, rust inhibitor or VCI, plate stencil (heat no., grade, size, weight, condition, PO).
• Logistics: dunnage and anti-slip spacers; marine moisture protection. CE/PED, class or DNV paperwork available on request.
7. Representative Spec Lines (ready to paste)
• PVQ plate: SA-516 Gr.70 N, 40 × 2,500 × 12,000 mm, ASTM A578 Level B, CVN −46 °C 27 J, MTC 3.1.
• Cr-Mo plate: SA-387 Gr.11 Cl.2, 30 × 2,500 × 10,000 mm, Q+T, EN 10160 S2/E2, MTC 3.1.
• 9%Ni plate: A553 Type I, 20 × 3,000 × 12,000 mm, 100% UT, CVN −196 °C, CTOD per drawing.
• Offshore plate: EN 10225 S355G10+M, 50 × 3,500 × 12,000 mm, EN 10164 Z25, UT S2/E2, CVN −40 °C, MTC 3.2 if required.
• Line-pipe skelp: API 5L PSL2 X70M (TMCP), 22 × 4,000 × 12,000 mm, DWTT pass, HIC/SSC pass, UT S3/E3.
• High-strength: EN 10025-6 S690Q, 60 × 2,500 × 8,000 mm, UT S2/E2, special flatness.
• Stainless plate: ASTM A240 316L (Solution Annealed + Pickled), 12 × 2,000 × 6,000 mm, ASTM A967 passivation, No.1 surface.
Medium & Heavy Thickness Steel Plates (Carbon / Alloy / Stainless / Titanium)｜Technical Specifications
1) Scope
Hot-rolled medium & heavy plates (TMCP / N/NR / Q+T) plus stainless & titanium plates for structural/bridge, offshore, pressure vessel/boiler, shipbuilding, cryogenic, chemical/desalination and architectural weathering applications.
2) Standards Matrix
General requirements (must be referenced)
• Structural/alloy: ASTM A6/A6M or EN 10029 + EN 10163-2 + EN 10079
• Pressure vessel: ASTM A20/A20M
• Stainless: ASTM A480/A480M (with ASTM A240)
• UT: EN 10160 (S/E) or ASTM A578 (Level A/B/C)
• Z-properties: EN 10164 (Z15/Z25/Z35)
Structural & High-strength
• EN 10025-2/-3/-4/-6 (S235…S690QL/QL1)
• GB/T 1591 (Q355/Q460/Q690)
• ASTM A572 / A709 (bridges)
Offshore
• EN 10225 (S355Gx/S420Gx/S460Gx, +M/+Q)
• API 2W / 2H
Pressure vessel/boiler
• ASTM A516 (Gr.55/60/65/70, N), ASTM A537 (Cl.1/Cl.2, Q+T)
• EN 10028-2/-3/-5/-6
• GB 713 (Q245R/Q345R/15CrMoR…)
• (Boiler tubing steels noted for cross-reference; plates remain per A516/A537/EN 10028.)
Shipbuilding
• ASTM A131 (A/B/D/E, AH/DH/EH36) + ABS/LR/DNV/BV/CCS
• GB/T 712 (Ship & offshore structural steels)
Stainless (pressure)
• ASTM A240 + A480; EN 10028-7
Cryogenic
• ASTM A203 / A353 / A553-1, EN 10028-4
Titanium
• ASTM B265, GB/T 3621
3) Material Families & Typical Grades
• Structural/bridge: S355J2/M/N, S460M/ML, S690QL/QL1; Q355D/E, Q460D/E, Q690D/E
• Offshore: EN 10225 S355G8+M / S420G2+M / S460G2+M, API 2W Gr.50/60, 2H Gr.50
• Pressure vessel: A516 Gr.70N, A537 Cl.1/Cl.2, P275N/P355N (EN 10028-3), P355ML1/ML2 (-5), P460Q/QL/QL1 (-6), Q245R/Q345R/15CrMoR
• Cryogenic: A203 (Ni steel), A353/A553-1 (9%Ni)
• Ship plate: A/B/D/E, AH/DH/EH36
• Stainless: A240 304/316L/321/347/904L/254SMo, Duplex 2205/2507; EN 1.4301/1.4404/1.4462/1.4410
• Titanium: B265 Gr.1/2/5/7/9
4) Size Capability & Tolerances
• Thickness t: 4.5–150 mm (typical), up to 200+ mm depending on mill
• Width W: 1500–4800/5000 mm; Length L: 3000–20000 mm
• Edges: mill-edge / flame-cut / machined & beveled
• Tolerances/flatness: EN 10029 (flatness Class N/S) or ASTM A6/A480
• Levelness: hot-leveled or tension-leveled as ordered
5) Manufacturing Route
Steelmaking (BOF/EAF → LF/VD/VOD → Ca treatment/low-S) → slab/ingot → reheating → hot rolling (TMCP optional) → accelerated cooling → leveling → heat treatment (N/NR, Q+T, double-normalized & tempered for 9%Ni) → UT → cutting/edge-milling → shot-blast Sa2.5 + shop primer (Zn-rich 20–25 µm) → marking/packing.
Stainless/Ti: pickling/passivation; surface No.1/2B/AP; Ti per B265 (annealed/ML).
6) Properties & Application Mapping
• Bridges/heavy structures: S460M/ML, S690QL/QL1; CVN at −40 °C, EN 10160 S2/E2, Z25/Z35 at restraint zones.
• Offshore: EN 10225 or API 2W/2H; CVN ≤ −40 °C; CTOD as specified.
• General vessels: A516 Gr.70N + A20; UT Level B/C; consider HIC/SSC for sour.
• High-pressure/thick wall: A537 Cl.2 or EN 10028-6 (P460Q/QL).
• LNG/cryogenic: A553-1/A353; −196 °C CVN/DT, UT Level C.
• Shipbuilding: A131 AH/DH/EH36 with class cert; add UT/Z as needed.
• Chemical/desalination: A240 316L/2205/2507/254SMo or B265 Gr.2/7; consider clad plates.
• Weathering: EN 10025-5 / ASTM A588.
7) QA & Testing
• Chemistry/mechanics: OES/ICP, YS/UTS/El, CVN temperature & orientation (L/T)
• UT: EN 10160 S?/E? (S2/E2 typical; S3/E3 for critical) or ASTM A578 Level B/C; define full-plate vs edge-zone scan
• Z-direction: EN 10164 Z15/Z25/Z35; supplier statement on Ca-treatment/low-S/inclusion control
• HIC/SSC: NACE TM0284/TM0177 (if sour)
• CTOD/DWTT: per ISO 12135 / BS 7448 where required
• Surface/flatness: EN 10163-2 / EN 10029 or ASTM A6/A480
• Documentation: EN 10204 3.1/3.2, HT charts, UT/CVN/CTOD reports; class approvals for ship plates
8) Delivery & Packing
Plates, nested parts, beveled parts; steel strapping + edge protectors + wood/steel pallets; anti-slip & moisture protection for sea freight; stenciling with grade/size/heat/PO; surface Sa2.5 + primer or rust-preventive oil.
9) RFQ/PO Checklist
1. Application & standard family (e.g., EN 10025-4 bridge; EN 10225 offshore; A516/A537 vessel; A240 stainless; A353/A553-1 cryogenic; B265 Ti)
2. Grade & delivery condition (e.g., S460M, S690QL, A516 Gr.70N, A537 Cl.2, P355ML2, S355G8+M, A240 316L, B265 Gr.2)
3. Dimensions t × W × L and tolerance standard (EN 10029 Class N/S or ASTM A6/A480)
4. Impact temp/value (−20/−40/−60/−196 °C) & direction (L/T)
5. UT level/coverage (EN 10160 S?/E? or ASTM A578 Level B/C; full vs strip)
6. Z-properties (Z15/Z25/Z35) & cleanness/inclusion control
7. HIC/SSC/CTOD (as applicable)
8. Surface/corrosion protection (black / Sa2.5 + shop primer; edge-milling/bevel per ISO 9692-1)
9. Docs/witness (3.1/3.2, class, TPI points/ITP)
10) Risk Checklist
• Substituting structural for pressure vessel grades (A36/EN 10025 vs A516/EN 10028)
• Using withdrawn DIN instead of EN; missing year of standard
• Vague “UT A/B/C/D” without standard/coverage definition
• No Z-direction for thick restrained joints; no Ca-treatment/low-S requirements
• Impact temperature/orientation unspecified
• Cryogenic service without 9%Ni or equivalent metallurgy
• Offshore/arctic without CTOD
• Stainless/Ti pressure plates without A480/EN 10028-7/B265 general reqs
• Blasting/priming not aligned to ISO 12944/SSPC
11) Sample Spec Lines
• Pressure vessels:
"Plate, ASTM A516 Gr.70, Normalized, t=40mm × W=3000mm × L=12000mm; UT per ASTM A578 Level C (full scan); CVN 27J @ −40°C (L/T); EN 10204 3.2; Edges milled & bevel per ISO 9692-1; A20 requirements apply."
• Offshore:
“Plate, EN 10225 S420G2+M, t=50mm × W=3500mm × L=12000mm; UT EN 10160 S2/E2; CVN 47J @ −40°C; CTOD @ −10°C as specified; Z25; 3.2 by DNV.”
• LNG/Cryogenics:
“Plate, ASTM A553-1 (9%Ni) Q+T, t=30mm × W=2600mm × L=10000mm; UT Level C; CVN 27J @ −196°C; EN 10204 3.2; Heat-treatment charts attached.”
• High-strength bridge:
“Plate, S690QL (EN 10025-6), t=25mm × W=2500mm × L=12000mm; UT S2/E2; CVN 30J @ −40°C; Z25; Flatness per EN 10029 Class S.”
• Stainless steel/chemical corrosion resistant:
“Plate, ASTM A240 316L, t=12mm × W=2000mm × L=6000mm; A480 general requirements; Pickled & Passivated; PMI 100%; 3.1.”
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