A283 Grade C Carbon Steel Plate — Factory Direct Supplier | Huaxia-Steel

ASTM A283 Grade C is the workhorse low/intermediate-tensile carbon steel plate for general structural and non-critical pressure applications: base plates, gussets, storage tank shells and floors, silos, machine frames, and construction hardware. With a 0.24% max carbon, tensile of 380–515 MPa, and excellent weldability and formability, A283 GrC hits the sweet spot where ordinary structural steel is not quite enough but pressure-vessel grades (A516) are unnecessary cost. Huaxia-Steel supplies A283 GrC plate from 3 mm to 200 mm thick in widths to 3,500 mm, mill edge or cut-to-size, with EN 10204 3.1 certification.

Product Overview

Process: hot-rolled or normalized plate; as-rolled delivery standard for ≤ 40 mm, normalized recommended above.

Size range: thickness 3–200 mm; width 1,250–3,500 mm; length 3,000–18,000 mm; cut-to-size service with plasma, laser (≤ 25 mm), or oxy-fuel.

Best for: general fabrication, storage tanks (API 650 non-impact service), structures where cost matters and impact testing is not required.

Certification: EN 10204 3.1 per shipment; 3.2 third-party witness available.

Note: A283 has no Charpy requirement — for low-temperature service order A516 Gr55/60 or A572 instead.

Specification Table

Parameter	Range / Value
Thickness	3 – 200 mm
Width	1,250 – 3,500 mm
Length	3,000 – 18,000 mm
Tensile strength	380 – 515 MPa (mandatory band)
Yield strength min	205 MPa
Elongation min (200 mm / 50 mm gauge)	23% / 25%
Thickness tolerance	per ASTM A20/A6 category; ±0.3–1.8 mm by thickness
Flatness	≤ 5–14 mm/m per A6 depending on thickness class
Surface	hot-rolled mill scale; blasted + primed on request

Chemical Composition (ASTM A283)

Element	Grade A	Grade B	Grade C	Grade D
Carbon max	0.14	0.17	0.24	0.27
Manganese max	0.90	0.90	0.90	0.90
Phosphorus max	0.035	0.035	0.035	0.035
Sulfur max	0.040	0.040	0.040	0.040
Copper min (when specified)	0.20	0.20	0.20	0.20

Grade C is the commercial center of the standard — the 380–515 MPa tensile band with 205 MPa yield min gives fabricators predictable forming and welding behavior. Because the standard caps chemistry loosely (Mn ≤ 0.90%), mills commonly deliver heats that also dual-certify to GB Q235B/Q255 or SS400-class structural bands; ask for dual certification if your supply chain mixes standards.

Manufacturing Standards and Process Control

Plate is produced from continuously cast slabs rolled on hot-strip or plate mills, with delivery per ASTM A6 (structural plate requirements govern tolerances, straightness, and testing frequency). Heat treatment options: as-rolled (standard), or normalized 900–920°C when better uniformity is wanted for heavier sections. Testing per heat/lot: tensile (mandatory band, not just minimums — verify the actual result lands inside 380–515 MPa, a frequent audit finding), bend test on request, and surface/UT inspection optional (ASTM A435 full-plate UT available for tank work). Every plate carries heat number and grade stenciling traceable to the EN 10204 3.1 certificate.

Applications

Storage tank shells, floors, and roofs (API 650, non-impact service)

Base plates, gussets, splice plates, shims in structural steelwork

Silos, hoppers, chutes, and material handling equipment

Machine frames, beds, and general fabrication plate

Low-pressure air receivers and non-code vessels where specified

Quality Assurance

EN 10204 3.1 MTC with ladle analysis and tensile actuals

Thickness, flatness, and dimensional report per ASTM A6

UT scan (ASTM A435/A578) on request for tank and fabrication plate

Third-party inspection (SGS/BV/TÜV) welcome before shipment

Packaging and Shipping

Mill-edge plates bundled ≤ 5 t, steel-strapped with dunnage; cut plates interleaved with paper

Heat-number and grade stenciling on every plate; bundle tags with qty/size/heat list

Container shipment for ≤ 2.4 m widths; break-bulk/bulk carrier for wide plate

Shot-blasted + primed (15–25 µm shop primer) available for coastal delivery