ASME SA387 Grade 11 Class 2 (SA387 Gr 11 Cl 2) Steel Plate

What is ASME SA387 Grade 11 Class 2?

ASME SA387 Grade 11 Class 2 steel plate is a cornerstone for industries facing thermal extremes. This SA387 Gr 11 Cl 2 grade, with its quenched and tempered finish, offers tensile strength of 515-690 MPa, making it ideal for pressure vessels at 550°C and 400 bar. SHH STEEL’s export-quality plates ensure your systems stay operational.

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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

Governed by ASME SA-387/SA-387M, this grade focuses on quenched and tempered plates for high-temp service. SHH STEEL’s compliance includes ultrasonic checks and custom sizing.

Specification Element	Requirement	SHH STEEL Compliance	Keywords
Primary Standard	ASME SA-387/SA-387M	ASME Section VIII	SA387 Gr 11 Cl 2 specification
Thickness Range	6mm-100mm (custom)	Mill Test Certificate	SA387 Gr 11 Cl 2 dimensions
Width/Length	Up to 4600mm / 12000mm	Custom fabrication available	SA387 Gr 11 Cl 2 size options
Ultrasonic Testing	No laminations >0.25% thickness	Class 1 per ASME SA-578	SA387 Gr 11 Cl 2 inspection
Heat Treatment	Quenched and tempered	870-900°C quench, 620-650°C temper	SA387 Gr 11 Cl 2 heat treat

Chemical Composition

The alloy’s mix, with Cr and Mo, resists corrosion and creep. Low carbon aids weldability.

Element	Melt Analysis (%)	Product Analysis (%)	Standard Limit	Test Method	Role	Keywords
Carbon (C)	0.05-0.17	0.04-0.18	0.17 max	ASME SA-350	Strength without brittleness	SA387 Gr 11 Cl 2 carbon
Manganese (Mn)	0.40-0.65	0.35-0.73	0.40-0.65	ASME SA-350	Toughness, hardenability	SA387 Gr 11 Cl 2 manganese
Phosphorus (P)	≤0.025	≤0.025	0.025 max	ASME SA-350	Reduces brittleness	SA387 Gr 11 Cl 2 phosphorus
Sulfur (S)	≤0.025	≤0..025	0.025 max	ASME SA-350	Improves weldability	SA387 Gr 11 Cl 2 sulfur
Silicon (Si)	0.50-0.80	0.44-0.86	0.50-0.80	ASME SA-350	Deoxidation, fluidity	SA387 Gr 11 Cl 2 silicon
Chromium (Cr)	1.00-1.50	0.94-1.56	1.00-1.50	ASME SA-350	Corrosion resistance	SA387 Gr 11 Cl 2 chromium
Molybdenum (Mo)	0.45-0.65	0.40-0.70	0.45-0.65	ASME SA-350	Creep resistance	SA387 Gr 11 Cl 2 molybdenum

Mechanical Properties

Q&T treatment gives this grade its edge, with 515-690 MPa tensile for 550°C ops.

Property	Value	Test Method	Temperature (°C)	Thickness Effect	Keywords
Tensile Strength	515-690 MPa	ASME SA-370	Ambient	-5% >100mm	SA387 Gr 11 Cl 2 tensile
Yield Strength	310 MPa (min)	ASME SA-370	Ambient	Stable to 100mm	SA387 Gr 11 Cl 2 yield
Elongation	18% (min)	ASME SA-370	Ambient	16-20% (6-25mm)	SA387 Gr 11 Cl 2 elongation
Impact Energy	27J typical	ASME SA-23	Ambient	All thicknesses	SA387 Gr 11 Cl 2 impact
Modulus of Elasticity	200 GPa	ASME SA-111	Ambient	Constant	SA387 Gr 11 Cl 2 modulus
Fatigue Limit	220 MPa (est.)	ASME SA-466	Ambient	Varies with surface	SA387 Gr 11 Cl 2 fatigue

Heat Treatment

Quench at 870-900°C, temper at 620-650°C – SHH STEEL’s process optimizes for heat resistance.

Factor	Value/Condition	Standard	Recommended	Keywords
Heat Treatment	Quench 870-900°C, Temper 620-650°C	ASME SA387	Q&T standard	SA387 Gr 11 Cl 2 heat treat

Delivery

Delivered quenched and tempered, with 3-7 day transit to Asia. Full traceability included.

Factor	Value/Condition	Standard	Recommended	Keywords
Delivery Condition	Quenched & Tempered	ASME SA-20	Transit 3-7 days Asia	SA387 Gr 11 Cl 2 delivery

Tolerances

ASME SA-20 tolerances ensure perfect fit, with custom options for your needs.

Factor	Value/Condition	Standard	Recommended	Keywords
Thickness Tolerance (<40mm)	±1.5mm	ASME SA-20	6-40mm	SA387 Gr 11 Cl 2 tolerance
Flatness	3mm per meter	ASME SA-20	All	SA387 Gr 11 Cl 2 flatness

Weldability

Low CE makes welding straightforward. Preheat and PWHT recommended for best results.

Weldability Factor	Value/Condition	Standard	Recommended Process	Keywords
Carbon Equivalent (CE)	≤0.45	AWS D1.1	GTAW, SMAW	SA387 Gr 11 Cl 2 weldability
Preheating (°C)	150-200 (>25mm)	ASME Section IX	GMAW	SA387 Gr 11 Cl 2 welding
PWHT (°C)	620-650	ASME SA-20	All	SA387 Gr 11 Cl 2 heat treat
Filler Metal	E7018	AWS A5.1	SMAW	SA387 Gr 11 Cl 2 welding rod
Bend Test Radius (mm)	3t (t=thickness)	ASTM E190	All	SA387 Gr 11 Cl 2 bend test

Equivalent Grades

Equivalents like 13CrMoSi5-5 in EN allow easy standard switching.

Grade	Standard	Tensile (MPa)	Yield (MPa)	Elongation (%)	Impact (J)	Keywords
SA387 Gr 11 Cl 2	ASME SA387	515-690	310	18	27	SA387 Gr 11 Cl 2 equivalent
13CrMoSi5-5	EN 10028-2	440-590	290	22	27	SA387 Gr 11 Cl 2 EN grade
SCMV3	JIS G4109	440-590	290	22	27	SA387 Gr 11 Cl 2 JIS grade
12Cr1MoVR	GB/T 713	440-590	295	19	27	SA387 Gr 11 Cl 2 GB grade
A387 Gr 11 Cl 2	ASTM A387	515-690	310	18	27	SA387 Gr 11 Cl 2 ASTM grade
12Cr1MoV	GB 713	440-590	295	19	27	SA387 Gr 11 Cl 2 alternative

Supplementary Requirements

Add ultrasonic or Charpy testing for specialized needs. SHH STEEL tailors to your specs.

Requirement	Detail	Standard	Test Frequency	Applicable Thickness (mm)	Keywords
Ultrasonic Testing	Class 1, no laminations	ASTM A435	Full plate	6-100	SA387 Gr 11 Cl 2 ultrasonic
Charpy Impact	-50°C, 27J min	ASTM A20	Per heat	6-100	SA387 Gr 11 Cl 2 cold impact
Heat Analysis	Per heat number	ASTM E350	Each batch	All	SA387 Gr 11 Cl 2 analysis
Product Analysis	±0.02% tolerance	ASTM E350	Sample per lot	All	SA387 Gr 11 Cl 2 product test
Shot Blasting	Sa 2.5, 50-100μm profile	ISO 8501-1	On request	6-50	SA387 Gr 11 Cl 2 blasting

Applications

SA387 Gr 11 Cl 2 thrives in heat-heavy roles, from vessels to exchangers.

Application	Temperature (°C)	Pressure (bar)	Thickness (mm)	Standard Compliance	Keywords
Pressure Vessels	Up to 550	400	20-100	ASME Section VIII	SA387 Gr 11 Cl 2 vessels
Boilers	Up to 550	300	10-80	ASME Section I	SA387 Gr 11 Cl 2 boilers
Heat Exchangers	Up to 500	200	6-50	TEMA Standards	SA387 Gr 11 Cl 2 heat exchange
Storage Tanks	Up to 450	150	30-100	API 650	SA387 Gr 11 Cl 2 tanks
Offshore Equipment	Up to 500	300	20-80	ABS Rules	SA387 Gr 11 Cl 2 offshore

Why Choose SHH STEEL

SHH STEEL offers ASME and ASTM-certified SA387 Gr 11 Cl 2 plates. We provide custom thicknesses up to 300mm. Heat treatments are tailored to your project. Our 15-year track record includes zero defect deliveries to 50+ countries. This is backed by SGS verification and mill test certificates.

Advantage	Benefit	Keywords
Expert Certification	ASME Section VIII compliant	SA387 Gr 11 Cl 2 certified
Custom Fabrication	Up to 300mm thickness	SA387 Gr 11 Cl 2 custom
Proven Reliability	50+ countries, zero rejects	SA387 Gr 11 Cl 2 trusted supplier

FAQ

What is ASME SA387 Grade 11 Class 2 used for?

ASME SA387 Grade 11 Class 2 is widely used for high-temperature pressure vessels, boilers, and heat exchangers in power generation and petrochemical industries. It handles temperatures up to 550°C and pressures to 400 bar, with 515-690 MPa tensile strength ensuring reliability. SHH STEEL supplies these for welded constructions per ASME Section VIII Division 1.

What is the difference between SA387 Gr 11 Cl 1 and SA387 Gr 11 Cl 2?

SA387 Gr 11 Cl 1 is normalized with 240 MPa yield for standard service, while Gr 11 Cl 2 is quenched and tempered with 310 MPa yield for higher strength. SHH STEEL recommends Gr 11 Cl 1 for moderate loads.

What is the chemical composition of SA387 Gr 11 Cl 2?

The composition includes C 0.05-0.17%, Mn 0.40-0.65%, P ≤0.025%, S ≤0.025%, Si 0.50-0.80%, Cr 1.00-1.50%, Mo 0.45-0.65%, tested per ASME SA-350. This formula ensures creep resistance with CE ≤0.45 (AWS D1.1). SHH STEEL provides MTCs with full analysis for traceability.

Is SA387 Gr 11 Cl 2 weldable?

Yes, SA387 Gr 11 Cl 2 is highly weldable with low carbon (0.05-0.17%) and preheating at 150-200°C for >25mm. Use E7018 filler (AWS A5.1) for 90% joint efficiency per ASME Section IX. PWHT at 620-650°C reduces stress, validated by bend tests per ASTM E190.

What is the density of SA387 Gr 11 Cl 2?

The density is 7.85 g/cm³, standard for alloy steel, aiding weight calculations in vessel design. Hardness is 163-235 HB (ASME SA-18), balancing wear resistance for high-temperature use.

What is the equivalent of ASME SA387 Gr 11 Cl 2 in EN standards?

The closest EN equivalent is 13CrMoSi5-5 (EN 10028-2), with 440-590 MPa tensile and 290 MPa yield, suitable for EU boilers. SHH STEEL provides dual-certified plates for seamless transitions.

What is the maximum thickness for SA387 Gr 11 Cl 2?

Standard thickness is 100mm, with custom options up to 300mm available. Quenched and tempered at 620-650°C per ASME SA-20, these plates are ideal for high-temperature vessels, with ultrasonic testing per ASME SA-578 ensuring no laminations for structural integrity.

Conclusion

SHH STEEL’s ASME SA387 Gr 11 Cl 2 Pressure Vessel Steel Plates provide unmatched strength and reliability for high-temperature pressure vessels and boilers. With precise tolerances, superior weldability, and global equivalents, we offer customized solutions. Trust SHH STEEL for your steel needs.