ASME SA387 Grade 22 Class 2 (SA387 Gr 22 Cl 2) Steel Plates

What is ASME SA387 Grade 22 Class 2？

ASME SA387 Grade 22 Class 2 (SA387 Gr 22 Cl 2) steel plates belong to the chrome-moly (Cr-Mo) alloy steel family, widely used in high-temperature pressure vessels, boilers, and heat exchangers.

With 2.25% chromium and 1% molybdenum, Grade 22 offers excellent high-temperature strength, creep resistance, and oxidation resistance. Compared with Class 1, Class 2 provides higher tensile and yield strength, making it suitable for more demanding applications at elevated service temperatures.

These plates are supplied in normalized and tempered (N+T) or quenched and tempered (Q+T) condition, ensuring a reliable combination of strength, toughness, and weldability.

asme sa387 grade 2 class 2	sme sa387 grade 11 class 2	asme sa387 grade 911 class 2
asme sa387 grade 91 class 2	asme sa387 grade 22 class 2	asme sa387 grade 21 class 2
asme sa387 grade 22l class 1	asme sa387 grade 12 class 1	asme sa387 grade 11 class 1
asme sa387 grade 9 class 2	asme sa387 grade 22 class 1	asme sa387 grade 12 class 2
asme sa387 grade 9 class 1	asme sa387 grade 5 class 2	asme sa387 grade 2 class 1
asme sa387 grade 5 class 1	asme sa387 grade 21 class 1	asme sa387 grade 21l class 1

Material Specification

Specification Element	Requirement	SHH STEEL Supply
Standard	ASME SA387 / ASTM A387	Pressure vessel quality alloy steel
Grade	22	2.25Cr-1Mo alloy
Class	2	Higher strength than Class 1
Thickness Range	6 – 150 mm	Custom up to 200 mm
Width/Length	Up to 4200 mm / 18000 mm	Large-format plates
Heat Treatment	Normalized + Tempered / Q+T	Furnace controlled
Inspection	UT, Charpy, 3rd-party	SGS / BV / TUV available

Chemical Composition

Element	Heat Analysis (%)	Product Analysis (%)	Remarks
Carbon (C)	0.08 – 0.15	0.07 – 0.16	Balances strength and weldability
Manganese (Mn)	0.30 – 0.60	0.28 – 0.65	Enhances toughness
Phosphorus (P)	≤ 0.025	≤ 0.030	Controlled for toughness
Sulfur (S)	≤ 0.010	≤ 0.015	Low sulfur for improved weldability
Silicon (Si)	0.50 – 1.00	0.45 – 1.05	Strengthens, improves oxidation resistance
Chromium (Cr)	1.90 – 2.60	1.85 – 2.65	Provides high-temperature oxidation resistance
Molybdenum (Mo)	0.87 – 1.13	0.85 – 1.15	Improves creep resistance at high temperatures
Nickel (Ni)	≤ 0.25	≤ 0.30	Residual, controlled
Copper (Cu)	≤ 0.25	≤ 0.30	Residual, controlled

Mechanical Properties

Property	Requirement	Test Method
Tensile Strength	515 – 690 MPa	ASTM A370
Yield Strength	≥ 310 MPa	ASTM A370
Elongation (200 mm)	≥ 18%	ASTM A370
Charpy V-Notch Impact	≥ 27J @ -20°C	ASTM A370
Hardness	190 – 240 HB	ASTM E18

Heat Treatment

Normalized at ~930–980°C
Tempered at 650–700°C
Optionally quenched and tempered (Q+T)

Delivery

Supplied in N+T or Q+T with EN 10204 3.1/3.2 certificates

Tolerances

Thickness: ±1.5mm (≤40mm), ±2.0mm (>40mm)
Width/Length: ±10mm standard
Flatness: ≤3mm/m

Weldability

Good weldability due to controlled carbon
Preheat may be required for thick plates (>50mm)
PWHT recommended for high-pressure service

Equivalent Grades

Standard	Grade	Notes
ASTM A387	Grade 22 Class 2	Equivalent
EN 10028-2	13CrMo4-5	European equivalent
DIN 17155	10CrMo9-10	German equivalent
JIS G3103	SBV2	Japanese equivalent
GB/T 21342	12Cr2Mo1R	Chinese equivalent

Supplementary Requirements

Ultrasonic testing (ASTM A435 / A578)
Impact testing at sub-zero temperature
Third-party inspection (SGS, TUV, BV)
Surface protection: shot blasting, primer coating

Applications

Application	Service Temp	Industry
Boilers	Up to 600°C	Power generation
Pressure Vessels	400–600°C	Petrochemical
Heat Exchangers	High temp	Refinery & LNG
Storage Tanks	Elevated	Oil & gas
Nuclear & Offshore	Harsh service	Energy sector

Why Choose SHH STEEL

15+ years of experience in chrome moly alloy steel supply
Large inventory of SA387 Grade 22 Class 2 plates
Fast global delivery with competitive prices
Mill test certificates (EN 10204 3.1/3.2)
Custom cutting, beveling, machining available

FAQ

What is ASME SA387 Grade 22 Class 2 used for?

It is used in boilers, pressure vessels, and heat exchangers operating at high temperature and pressure.

What is the difference between Class 1 and Class 2?

Class 2 has higher tensile and yield strength than Class 1, making it more suitable for demanding high-temperature applications.

What is the chemical composition of SA387 Gr 22 Cl 2?

It contains 2.25% chromium and 1% molybdenum, with controlled carbon, Mn, Si, and low residuals.

What are the mechanical properties?

Tensile strength 515–690 MPa, yield ≥310 MPa, elongation ≥18%, impact ≥27J at -20°C.

Is SA387 Grade 22 Cl 2 weldable?

Yes, it has good weldability, but preheating and post-weld heat treatment are often required for thick sections.

What thicknesses are available?

Standard thickness is 6–150mm, with customized supply up to 200mm.

What are the equivalent international grades?

EN 13CrMo4-5, DIN 10CrMo9-10, JIS SBV2, GB 12Cr2Mo1R.

What heat treatment condition is supplied?

Plates are supplied in normalized + tempered or quenched + tempered condition.

What industries commonly use SA387 Gr 22 Cl 2?

Power generation, refinery, petrochemical, nuclear, and offshore energy.

Does SHH STEEL provide third-party inspection?

Yes, we work with SGS, BV, and TUV to meet client requirements.

Conclusion

ASME SA387 Grade 22 Class 2 (SA387 Gr 22 Cl 2) steel plates are high-quality Cr-Mo alloy steel plates with excellent strength, toughness, creep resistance, and weldability, widely applied in boilers, pressure vessels, and petrochemical equipment.

With global stock availability, mill-certified quality, and reliable delivery, SHH STEEL is your trusted supplier of SA387 Gr 22 Cl 2 plates for critical high-temperature service projects.