What is the difference between SA 285 GR C and SA 283 GR C?

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What is the difference between SA 285 GR C and SA 283 GR C?

2025-12-02

SA 283 Gr C vs SA 285 Gr C

ASME SA 283 Gr C and SA 285 Gr C are both low-carbon steel plate specifications with similar mechanical properties, but they differ in intended applications and some chemical limits. SA 283 Gr C is for general structural use, while SA 285 Gr C is specifically for pressure vessels with stricter requirements for boilers and tanks.

As a leading Chinese manufacturer and exporter, GNEE Steel offers high-quality SA 283 grade C steel plate under ASME SA 283/SA 283M, providing cost-effective options for structural projects where pressure vessel specs are not required.

What is ASME SA 283 Gr C and SA 285 Gr C

SA 283 Gr C is a low to intermediate tensile strength carbon steel under ASME SA 283 for general structural applications, not permitted for pressure-retaining use due to less stringent controls. SA 285 Gr C is a pressure vessel steel under ASME SA 285, designed for fusion-welded boilers and vessels with similar strength but better suitability for high-pressure environments. GNEE Steel’s SA 283 Grade C steel plate is ideal for non-pressure structural needs, complementing our range including SA 283 Grade A steel plate, SA 283 Grade B steel plate, and SA 283 Grade D steel plate.

Property	SA 283 Gr C	SA 285 Gr C
Standard	ASME SA 283	ASME SA 285
Type	Structural carbon steel	Pressure vessel carbon steel
Yield Strength (min, ksi/MPa)	30 / 205	30 / 205
Tensile Strength (ksi/MPa)	55-75 / 380-515	55-75 / 380-515
Applications	General structures, low-pressure tanks	Boilers, pressure vessels
Heat Treatment	As-rolled	As-rolled
Interchangeability	Not for pressure-retaining	Suitable for pressure use

Chemical Composition Comparison

SA 283 Gr C and SA 285 Gr C have similar compositions, but SA 285 has slightly higher carbon allowance for pressure vessel suitability. Below is a table of typical compositions (in weight %, maximum unless specified):

Element	SA 283 Gr C	SA 285 Gr C
C (Carbon)	0.24	0.28
Mn (Manganese)	0.90	0.90
P (Phosphorus)	0.035	0.035
S (Sulfur)	0.040	0.035
Si (Silicon)	0.40	0.35
Cu (Copper, min if specified)	0.20	–

Mechanical Properties Comparison

Both grades have identical mechanical requirements, with no impact testing mandated. The table below details typical values:

Property	SA 283 Gr C / SA 285 Gr C
Yield Strength (min, ksi/MPa)	30 / 205
Tensile Strength (ksi/MPa)	55-75 / 380-515
Elongation (min, % in 8″)	22
Hardness (Brinell, approx)	119-162

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