ASTM A387 ASME SA387 steel plate

Product Application: Boiler superheaters, reheaters, economizer tube sheets and headers, hydrogenation reactors, reforming units, cracking furnace tube supports (capable of withstanding high temperature, high pressure, and hydrogen containing environments), thermal/nuclear power boiler pressure vessels, steam pipeline flanges, high-temperature flues, waste heat boilers, and other heat-resistant and pressure bearing structures

Delivery conditions:The goods can be delivered under various conditions, such as hot rolling, normalization, tempering, quenching, N+T, T+Q, etc.

Specifications & Standards:Refer to the table below

Consultation Hotline: 0086-371-55023661

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CategoryDetails
Executive StandardsASTM A387/A387M-22, ASME SA387/SA387M
Common Grades11, 12, 22, 22L, 91, 911
Specification RangeThickness: 6 – 150 mm (thick plates must meet flaw detection requirements)
Width: 1000 – 3000 mm
Length: 1000 – 20000 mm (custom sizes negotiable)
Delivery Form: Steel plate, cut-to-size plate, flaw detection plate (provided on demand)
Chemical Composition (%) (Melting Analysis)Grade 11 (1.25Cr-0.5Mo): C ≤ 0.15, Si 0.50-1.00, Mn 0.40-0.70, P ≤ 0.035, S ≤ 0.035, Cr 1.00-1.50, Mo 0.44-0.65
Grade 12 (1Cr-0.5Mo): C ≤ 0.15, Si 0.15-0.40, Mn 0.30-0.60, P ≤ 0.035, S ≤ 0.035, Cr 0.80-1.10, Mo 0.45-0.60
Grade 22 (2.25Cr-1Mo): C ≤ 0.15, Si 0.50-1.00, Mn 0.40-0.70, P ≤ 0.035, S ≤ 0.035, Cr 2.00-2.50, Mo 0.90-1.10
Grade 22L (Low Sulfur): S ≤ 0.010, others same as Grade 22
Grade 91 (9Cr-1Mo-V-Nb): C 0.08-0.12, Si 0.20-0.50, Mn 0.30-0.60, P ≤ 0.020, S ≤ 0.010, Cr 8.00-9.50, Mo 0.85-1.05, V 0.18-0.25, Nb 0.06-0.10
Mechanical Properties (Normalized + Tempered State)Grade 11/12/22:- Tensile Strength: ≥ 415 MPa
Yield Strength: ≥ 205 MPa (thickness ≤ 100mm); ≥ 170 MPa (thickness ＞ 100mm)
Elongation (A5): ≥ 22%
Impact Energy (20℃): ≥ 41 J (Charpy V-notch)Grade 91:
Tensile Strength: 620 – 795 MPa
Yield Strength: ≥ 415 MPa
Elongation (A5): ≥ 20%
Impact Energy (-10℃): ≥ 47 J
Heat Treatment StateNormalizing: Grade 11/12/22 at 900-980℃ air cooling; Grade 91 at 1040-1080℃ air cooling / forced cooling
Tempering: Grade 11/12/22 at 620-705℃ air cooling; Grade 91 at 730-780℃ air cooling
Core Requirement: Ensure grain refinement, eliminate internal stress, enhance high-temperature stability
High-Temperature Performance (Key Indicators)Grade 22: Tensile strength ≥ 150 MPa at 600℃; Creep Rupture Strength (10⁵h) ≥ 45 MPa
Grade 91: Tensile strength ≥ 200 MPa at 650℃; Creep Rupture Strength (10⁵h) ≥ 80 MPa
Applicable Temperature Range: Grade 11/12 (≤ 550℃), Grade 22 (≤ 600℃), Grade 91 (≤ 650℃)
Processing TechnologyWelding: Preheating to 200-300℃ required; use low-hydrogen electrodes (e.g., E8018-B2); post-weld tempering at 650-700℃ for stress relief
Cutting: Flame cutting (thickness ＞ 10mm), laser cutting (thickness ≤ 20mm); preheating required for thick plates to prevent cracking
Machinability: Good in annealed state; hardness increases after quenching & tempering (200-250 HB); cemented carbide tools recommended
Application FieldsBoiler Equipment: Superheaters, reheaters, economizer tube sheets, and headers
Petrochemical Industry: Hydrocracking reactors, reformers, cracking furnace tube supports (resist high-temperature, high-pressure hydrogen-containing environments)
Power Industry: Thermal/nuclear power boiler pressure vessels, steam pipe flanges
Others: Heat-resistant and pressure-bearing structures such as high-temperature flues and waste heat boilers
Inspection RequirementsRoutine Testing: Tensile test, impact test, hardness test, chemical composition analysis
Non-Destructive Testing (NDT): Ultrasonic flaw detection (ASME SA-578 Level B, 100% coverage); magnetic particle/penetrant testing supplementary for thick plates
Certificate Requirements: Provide ASME U Stamp certification, EN 10204 3.2 material certificate, including high-temperature performance test report
Core CharacteristicsHeat Resistance: Chromium-molybdenum alloy forms a dense oxide film to inhibit high-temperature oxidation and corrosion
Creep Resistance: Strengthened by alloying elements (V, Nb) for minimal deformation under long-term high temperature
Hydrogen-Induced Cracking (HIC) Resistance: Grade 22L’s low-sulfur design suits harsh conditions containing hydrogen and hydrogen sulfide
Weld Compatibility: Low carbon equivalent (≤ 0.45%) ensures low welding crack sensitivity

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