High Temp Performance of A387 Gr22 Cl2 Alloy Steel Plate

Description: ASTM A387 Grade 22 Class 2 pressure vessel steel falls under the ASTM A387 specification for chromium-molybdenum alloy steel plates designed for high-temperature service. This grade specifically targets welded boilers and pressure vessels operating above ...

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ASTM A387 Grade 22 Class 2 pressure vessel steel Description

ASTM A387 Grade 22 Class 2 pressure vessel steel falls under the ASTM A387 specification for chromium-molybdenum alloy steel plates designed for high-temperature service. This grade specifically targets welded boilers and pressure vessels operating above 500°C (932°F), with Class 2 denoting normalized-and-tempered heat treatment for enhanced toughness.

A387 Gr.22 CL.2 alloy steel for pressure vessel applications excels in:

Elevated Temperature Strength: Retains yield strength >140 MPa at 590°C (per ASME Sec. II-D).
Hydrogen Attack Resistance: Mo-carbide network inhibits decarburization in H₂-rich environments.
Thermal Fatigue Resistance: Low ΔT cracking sensitivity during cyclic heating/cooling.
Weldability: Controlled preheat (175–230°C) + mandatory PWHT (690–730°C) ensures joint integrity.

ASTM A387 Grade 22 Class 2 pressure vessel steel Datasheet

Form	Thickness (mm)	Width/Length (mm)
Plates	5–250	1,500–4,500 x 6,000–18,000
Tubes & Shells	Custom	OD ≤ 3,500

ASTM A387 Grade 22 Class 2 pressure vessel steel Chemical composition

The chemical composition of A387 Grade 22 Class 2 is optimized for high-performance applications.

Element	Min	Max	Role
C	–	0.15	Strength/Carbide Formation
Mn	0.30	0.60	Hardenability Control
P	–	0.025	↓ Temper Embrittlement
S	–	0.025	Machinability Enhancement
Si	0.50	0.80	Deoxidation & Strength
Cr	2.0	2.5	Oxidation/Corrosion Barrier
Mo	0.9	1.1	Creep Resistance

ASTM A387 Grade 22 Class 2 pressure vessel steel Mechanical Properties

The physical properties of A387 Grade 22 Class 2 ensure its suitability for high-stress environments.

Property	Value
Tensile Strength	515–690 MPa
Yield Strength	≥310 MPa
Elongation (50 mm)	≥18%
Hardness (HB)	≤156–201
Density	7.85 g/cm³

Equivalent Grade of ASTM A387 Grade 22 Class 2 pressure vessel steel

A387 Grade 22 Class 2 boiler steel has equivalent grades in other standards, providing flexibility in material selection.

Standard	Equivalent Grade	Key Variation
EN 10028-2	10CrMo9-10	Similar Cr-Mo, tighter Si control
JIS G4109	SCMV 6	Japan H₂ service certification
GB 713	12Cr2Mo1R	China boiler plate designation
ASME SA387	Gr.22 Cl.2	Directly identical