Carbon steel sheet plate and alloy steel medium-thick plates are sheet metal products made from carbon or low-alloy steel through hot-rolling or cold-rolling processes. They offer high strength, weldability, and formability, widely used in construction, mechanical engineering, automotive, shipbuilding, and pressure vessel industries. The products comply with international standards such as GB/T 709, ASTM A36/A533, and EN 10025.
Key Features
Standards:
International: ASTM A36 (carbon steel), ASTM A533 (low alloy steel), EN 10025 (structural steel).
Domestic: GB/T 709 (hot-rolled steel sheets), GB/T 1591 (low alloy high-strength structural steel).
Materials:
ASTM/ASME: A36, A572 Gr. 50 / 60, A516 Gr. 60/70, A537 Cl.1 / 2, A285, A709, A20 / A20M, AH32, DH32, AH36, DH36, EH32, EH36, A40, E40, API 2W, API 2H,A420~F690, S420G2+QT, DH40BCA~E47BCA, AW~E36W, LT-AH27S~LT-FH40, A514GrQ, A517GrQ, A283, A36, A572Gr42, Gr50Gr55, Gr60, Gr65, A573Gr58, Gr65, Gr70, A709Gr42, Gr50, A-387Gr11 / 12122 / P275NH, P275NL1, P275NL2, P355N. P355NH, P355NL1, P355NL2 / P355M, P355ML1, P355ML2, P420M. P420ML1, P420ML2, P460M, P460ML1. P460ML2 / 07MnMoVR, 07MnNiVDR / 07MnNiMoDR
EN (European): S235JR / J0 / J2, S275JR / J0 / J2, S355JR / J0 / J2 / K2, S355NL / M / ML, S420M, S460M, S420, S460, P265GH, P355GH, SM400A / B / C, SM490A / B/ CSM490YA / YB, SM520B / C.SM570C
JIS (Japanese): SS400, SM490, SM570
GB (Chinese): Q235B / C / D, Q345B / C / D, A36, 45#, 20#, Q355 (Q345), Q390, Q420, Q460, 16MnR (GB 713), NM360 / NM400 / NM450 / NM500 / NiRes360 / NiRes 400 / NiRes 450 / NiRes 500 / NM550 / NM600 / NiRes 550 / NiRes 600, Q245R, Q345R \ Q370R, 15CrMoR, 14Cr1MoR, 12Cr2Mo1R \ Q345R-HIC
API: 5L (Line Pipe Plate)
Low Alloy Steel: 16Mn, 20MnMo, 12Cr1MoV, 15CrMo.
Dimensions:
Thickness: 6 mm to 300 mm (0.24" to 12")
Width: 1,500 mm to 4,700 mm (59" to 197")
Length: 6,000 mm to 18,000 mm (20 ft to 60 ft), or customized
Tolerances: In full compliance with ASTM A6/A6M, EN 10029, GB/T 709, or customer-specified requirements.
Processing & Heat Treatment: As-Rolled (AR), Normalized (N), Thermomechanical Rolling (TMCP), Quenched & Tempered (QT)
Optional: Ultrasonic Testing (UT) per ASTM A578 or EN 10160, Magnetic Particle (MT), or Dye Penetrant (PT) inspection.
Surface Finish: Standard mill scale, sandblasted (Sa2.5), primed (epoxy or zinc-rich), or customized coating upon request.
Applications:
Construction: Steel structures, bridges, towers.
Mechanical Engineering: Structural components for construction machinery, hydraulic cylinders.
Automotive: Vehicle frames, chassis.
Shipbuilding/Marine Engineering: Hull structures, deck supports.
Pressure Vessels: Boilers, reactors, storage tanks.
Certifications:
Shipbuilding Standards: ABS, LR, DNV, BV, GL, CCS, RINA(meet requirements for offshore platforms and shipbuilding)., etc.
Additional Certifications: Available with third-party inspection (e.g., SGS, BV) and compliance with PED, AD 2000, etc.
Owner/Engineering Firm Certifications: ISO 9001, API Q1, ASME SA36/SA533, GB/T 222.
Common Customer Questions (Q&A Format)
Q: What is the lead time for carbon/alloy steel medium-thick plates?
A: Typically 20–60 days, depending on order volume and production schedule.
Q: Do you support non-standard dimensions or special coatings?
A: Yes, we offer customized sizes (e.g., rectangular sheets, special thicknesses) and coatings (e.g., epoxy resin, galvanized layers).
Q: How is product quality ensured?
A: Third-party inspection reports (e.g., SGS, TUV) and full lifecycle traceability are provided to guarantee compliance with ASTM, GB/T, etc.
Q: What shipping methods are available? Is global delivery supported?
A: Options include sea, land, or air freight. We support containerized or bulk shipping to major global ports.
Q: What are the performance differences between hot-rolled and cold-rolled medium-thick plates?
A: Hot-rolled plates offer high strength and lower cost, suitable for thick plates; cold-rolled plates have higher surface finish and dimensional accuracy, ideal for precision stamping parts.
Q: Is 16Mn suitable for low-temperature environments?
A: Yes, 16Mn exhibits excellent low-temperature toughness between -20°C and 400°C, suitable for equipment in cold regions.
Q: Do you provide services to adapt to international standard differences?
A: Yes, we can adjust material specifications, dimensions, and standards (e.g., ASTM vs. GB/T) to meet target market requirements.
Q: What should be considered when welding medium-thick plates?
A: Pay attention to interpass temperature control (to avoid cold cracks), welding sequence (to reduce deformation), weld leg size (to ensure penetration), and bevel preparation (for smooth transition).
Q: What is MOQ
A: Normal steel grade is 1 pcs/5 tons per size, special grade to be discussed.
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