SA387 Gr.22 Cl.2 Pressure Vessel Steel

SA 387 Gr. 22 Class 2 is a 2.25Cr-1Mo alloy steel plate per ASTM A387, designed for high-temperature pressure vessels (up to 595°C/1100°F).It requires normalization + tempering (Class 2 condition), offering ≤220 HBW hardness and enhanced creep/oxidation resistance.Typical applications include refinery reactors, power plant boilers, and petrochemical equipment exposed to H₂/H₂S environments.

Chat Now

Send Inquiry

Product Description

1.What is the composition of SA387 Grade 22 Class 2?

Chemical Composition (Weight %)

Element	ASTM A387 Requirement	Typical Range
Carbon (C)	0.05–0.15%	0.08–0.12%
Manganese (Mn)	0.30–0.60%	0.40–0.55%
Phosphorus (P)	≤ 0.025%	≤ 0.020%
Sulfur (S)	≤ 0.025%	≤ 0.015%
Silicon (Si)	≤ 0.50%	0.20–0.40%
Chromium (Cr)	2.00–2.50%	2.10–2.30%
Molybdenum (Mo)	0.90–1.10%	0.95–1.05%

2.What is the temperature range for SA 387 GR 11 Cl 2?

In the lower end of the temperature range SA 387 Gr 11 (1150 °F min tempering temperature) , and SA 387 Gr 22 (1250 °F min tempering temperature) are used. These grades can be specified in either class 1 or 2 and can also be provided in the Normalized & Tempered or Quenched and Tempered.

3.What is the hardness of SA 387 GR 22 Class2?

Hardness Requirements:

Brinell Hardness (HBW): ≤ 220 HBW (standard requirement after normalization + tempering).

Typical Range: 180–210 HBW (actual measured values post-heat treatment).

Products Categories