ASTM A387 Grade 5/9/11/12/22/91 Chrome-Molybdenum Alloy Steel Plate: High-Temperature ASME Compliance & Custom Heat Treatment
Material Overview & Key Features
ASTM A387 specifies chromium-molybdenum alloy steel plates designed for 650°C high-temperature pressure vessels and hydrogen service equipment. With tensile strengths ranging from 380 MPa (Grade 12 Class 1) to 690 MPa (Grade 22 Class 2), these quenched-and-tempered plates meet ASME Section VIII requirements for critical petrochemical infrastructure.
Core Advantages:
- Hydrogen Embrittlement Resistance: 30% lower crack growth rate vs. carbon steels.
- Global Equivalents: EN 10028-2 13CrMo4-5 (Grade 11), JIS G4109 SCMV4 (Grade 22).
- Design Flexibility: Dual heat treatment classes (Class 1/Class 2) per grade.
Technical Specifications
1. Chemical Composition (ASTM A387M Standard)
| Grade | UNS | Cr Range | Mo Range | CEV* | Max Temp |
|---|---|---|---|---|---|
| Grade 5 | S50200 | 3.90–6.10% | 0.40–0.70% | 0.42 | 550°C |
| Grade 9 | K90941 | 7.90–10.10% | 0.85–1.15% | 0.58 | 600°C |
| Grade 22 | K21590 | 1.88–2.62% | 0.85–1.15% | 0.47 | 575°C |
| Grade 91 | K90901 | 7.90–9.60% | 0.80–1.10% | 0.63 | 650°C |
| *CEV = C + (Cr + Mo)/5 + (Mn + Si)/6 |
2. Mechanical Properties by Heat Treatment Class
| Grade | Class | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|---|---|---|---|
| Grade 5 | 1 | 415–585 | 205 | 18 |
| Grade 5 | 2 | 515–690 | 310 | 18 |
| Grade 22 | 1 | 415–585 | 205 | 18 |
| Grade 22 | 2 | 515–690 | 310 | 18 |
| Grade 91 | – | 585–760 | 415 | 16 |
Physical Properties:
- Density: 7.85 g/cm³ (0.284 lb/in³)
- Thermal Conductivity: 29.3 W/m·K (20–500°C)
Production & Fabrication
1. Heat Treatment Methods
- Class 1: Normalized (Grade 5/9/11: 900–960°C).
- Class 2: Quenched & Tempered (Grade 22/91: 1040°C oil quench + 730°C temper).
2. Surface Treatments
| Process | Technical Parameters | Industry Use Case |
|---|---|---|
| Hot Isostatic Pressing | 1200 bar @ 1150°C | Nuclear reactor vessels |
| Aluminizing | 80µm Al-Si coating (AMS 2478) | Sulfuric acid converters |
Industrial Applications
1. Petrochemicals
- Hydrodesulfurization Reactors: Grade 22 Class 2 (thickness 50–150mm).
- Delayed Cokers: Grade 9 forged shells (HIC tested).
2. Power Generation
| Component | Material Grade | Operational Limits |
|---|---|---|
| Superheater Headers | Grade 91 | 625°C @ 28MPa |
| Steam Lines | Grade 11 Class 2 | 540°C @ 16MPa |
3. Hydrogen Infrastructure
- Electrolyzer Pressure Vessels: Grade 5L plates (HE resistance).
- H2 Storage Spheres: Grade 12 seamless construction (NACE MR0175).
Quality Assurance
- Testing Protocols:
- Hardness control: HB 180–250 (Class 1), HB 240–300 (Class 2).
- Hydrogen-induced cracking (HIC) test per NACE TM0284.
- Certifications:
- ASME U Stamp + NBIC R Stamp.
- ISO 15614-1 welding qualification.
Delivery & Storage
- Dimensions:
- Width: 1,500–3,500mm (max length: 18m).
- Thickness tolerance: ±0.25mm (cold-rolled), ±0.8% (hot-rolled).
- Packaging: VCI film + edge guards (36-month anti-corrosion).
Welding Advisory: Use AWS A5.5 E8018-B2 electrodes with 150–200°C preheat for Grade 91*
Scope of Application
The molybdenum composition in ASTM A387 boiler vessel plate can improve its tensile strength at high temperature, and make it have higher oxidation and corrosion resistance by increasing the lattice strain. ASTM A387 Boiler Container Plates are ideal for use in heat-resistant pressure vessels and sour gas environments.
Equivalent Material
| American StandardASTM | European StandardASME | German StandardEN 10028 | English standardDIN | Legal standardBS | Russian standardAFNOR 36206 |
| A387 5 | SA387 5 | X12CrMo5 | – | – | – |
| A387 9 | SA387 9 | – | – | – | – |
| A387 11 | SA387 11 | 13CrMoSi5-5 | – | 621B | – |
| A387 12 | SA387 12 | 13CrMo4-5 | 13CrMo44 | 620B | 15CD2.05 |
| A387 22 | SA387 22 | 10/11CrMo9-10 | 10CrMo9-10 | 622-515B | 12CD9-10 |
| A387 91 | SA387 91 | 10CrMoVNb9-1 | – | — | – |
| China | USA | Germany | Japan | France | U.K. | internationality |
| GB3077 | AlSI | DIN | JIS | NE | BS | ISO |
| 20Mn2 | 1320
1221 |
20Mn5 | SMn21 | 20M5 | 150M19 | – |
| 30Mn2 | 1330 | 30Mn5 | SMn24 | 32M5 | 150M28 | – |
| 35Mn2 | 1335 | 36Mn5 | SMnl | 35M5 | 150M36 | – |
| 40Mn2 | 1340
1341 |
– | SMn2 | 40M5 | – | – |
| 45Mn2 | 1345 | 46Mn7 | SMn3 | 45M5 | – | – |
| 50Mn2 | 1052 | 50Mn7 | – | 55M5 | – | – |
| 20MnV | – | 20MnV6 | – | – | – | |
| 30Mn2MoW | – | — | – | – | – | |
| 27SiMn | – | 27MnSi5 | – | – | – | |
| 35SiMn | – | 37MnSi5 | – | 38MS5 | – | – |
| 42SiMn | – | 38MnSi4
46MnSi4 |
– | 38MS5 | – | – |
| 20SiMn2MoV | – | – | – | – | – | – |
| 25SiMn2MoV | – | – | – | – | – | – |
| 37SiMn2MoV | – | – | – | – | – | – |
| 40B | 14B35 | 35B2 | – | – | – | – |
| 45B | 50B46H | 45B2 | – | – | – | – |
| 50B | 14B50 | – | – | – | – | – |
| 4OM∏B | 15B41 | – | – | – | – | – |
| 45MnB | 15B48
50B44 |
– | – | – | – | – |
| 20Mn2B | – | – | – | – | – | – |
| 20MnMoB | 80B20 | – | – | – | – | – |
| 15MnVB | – | – | – | – | – | – |
| – | – | – | – | – | – | – |
| – | – | – | – | – | – | – |
| 20MnVB | – | – | – | – | – | – |
| 40MnVB | – | – | – | – | – | – |
| 20MnTiB | – | – | – | – | – | – |
| 25MnTiBRE | – | – | – | – | – | – |
| 2OSiMnVB | – | – | – | – | – | – |
| 15Cr | 5015
5115 |
15Cr3 | SCr21 | 12C3 | 523A14
523M15 |
– |
| 15CrA | – | – | – | – | – | – |
| 20Cr | 5120 | 20Cr4 | SCr22 | 18C3
18C4 |
527A19
527M20 |
683/11
20Cr4 20CrS4 |
| 30Cr | 5130 | 28Cr4 | SCr2 | 28C4
32C4 |
530A30
530A32 |
– |
| 35Cr | 5135 | 34Cr4
37Cr4 |
SCr3 | 38C4 | 530A36 | 683/8
3、 3a、 3b |
| 40Cr | 5140 | 38Cr4
41Cr4 |
SCr4 | 42C4 | 530A40
530M40 |
683/1
4、 4a^ 4b |
| 45Cr | 5145 | 42Cr4 | SCR5 | 45C4 | – | – |
| 50Cr | 5150
5152 |
– | – | 50C4 | En48 | – |
| 38CrSi | – | – | – | – | – | – |
| 12CrMo | 4119 | 13CrMo44 | – | 12CD4
15CD2 |
– | – |
| 15CrMo | ASTM
A-387Gr. B |
15CrMo5
16CrMo44 |
SCM21 | 15CD4. 05 | BS1653 | – |
| 20CrMo | 4118 | 20CrMo5
22CrMo4 |
SCM22 | 18CD4
20CD4 |
CDS 12
CDSllO |
– |
| 30CrMo | 4130 | 25CrMo4 | SCM2 | 30CD4 | CDS 13 | – |
| 30CrMoA | – | 32CrMol2
3ICRMo12 |
– | – | – | – |
| 35CrMo | 4135
4137 |
34CrMo4
35CrMo4 |
SCM3 | 35CD4 | 78A37 | 683/1
C35ea C35eb |
| 42CrMo | 4140
4142 |
41CrMo4
42CrMo4 |
SCM4 | 40CD4
42CD4 |
708M40
708A42 709M40 |
683/1
3 |
| 12CrMoV | – | – | – | – | – | – |
| 35CrMoV | – | 35CrMoV5 | – | – | – | – |
| 12CrlMoV | – | 13CrMoV4.2 | – | – | – | – |
| 25Cr2MoVA | – | 24CrMoV5.5 | – | – | – | – |
| 25Cr2MolVA | – | – | – | – | – | – |
| 20CR3MoWVA | – | 21CrVMoW12 | – | – | – | – |
| 38CrMoΛl | 6370 (ΛMS) | 34CrAlMo5
41CrAlMo7 |
SACM645 | 40CAD6.12 | 905M39 | 683/10
41CrAlMo74 |
| 20CrV | 6120 | 22CrV4 | – | 22CrV4 | – | – |
| 40CrV | 6140 | 42CrV | – | 42CrV4 | – | – |
| 50CrVA | 6150 | 50CrV4 | SUPlO | 50CV4 | 735A50 | – |
| 15CrMn | – | 16MnCr5 | – | 16MC5 | – | – |
| 20CrMn | 5120 | 20MnCr5 | SMC21 | 20MC5 | – | – |
| 40CrMn | 5140 | – | SMC3 | – | – | – |
| 20CrMnSi | – | – | – | – | – | |
| 25CrMnSi | – | – | SMKl | – | – | – |
| 30CrMnSi | – | – | – | – | – | – |
| 30CrMnSiA | – | – | – | – | – | – |
| 35CrMnSiA | – | – | SMK2 | – | – | – |
| 20CrMnMo | 4119 | 20CrMo5 | SCM23 | – | – | – |
| 40CrMnMo | 4140 | – | – | – | – | – |
| 20CrMnTi | – | – | SMK22 | – | – | – |
| 30CrMnTi | – | 30MnCrTi4 | – | – | – | – |
| 20CrNi | 3120 | 20NiCr6 | – | 20NC6 | 637A16
637M17 |
– |
| 40CrNi | 3140 | 46NiCr6 | SNCl | 35NC6 | 640A35
640M40 |
– |
| 45CrNi | 3145 | 45NiCr6 | – | – | – | – |
| 50CrNi | 3150 | – | – | – | – | – |
| 12CrNi2 | 3115 | 14NiCrlO | SNC21 | IONCll
14NC11 |
– | – |
| 12CrNi3 | 3310 | 13NiCrl2 | SNC22 | 10NC12
14NC12 |
655A12
655M13 |
– |
| 20CrNi3 | – | 22NiCrl4 | – | 20NC11 | – | – |
| 30CrNi3 | – | 28NiCrlO
31NiCrl4 |
SNC2 | 30NC11
30NC12 |
– | – |
| 37CrNi3 | – | 35NiCrl8 | SNC3 | 35NC15 | – | – |
| 12Cr2Ni4 | E3310 | 14NiCrl8 | – | 12NC15 | – | – |
| 20Cr2Ni4 | E3316 | 22NiCrl4 | – | 20NC14 | 659A15
659M15 |
– |
| 20CrNiMo | 8620
8720 |
20NiCrMo2
21NiCrMo2 |
– | 20NCD2 | 805A20
805M20 |
– |
| 40CrNiMoA | 4340
9840 |
36NiCrMo4
40NiCrMo6 |
SNCM8 | 35NCD5
40NCD3 |
817M40
816M40 |
– |
| 45CrNiMoVA | 4437 | – | SNCM9 | – | – | – |
| 18Cr2Ni4WA | ||||||
| 25Cr2Ni4WA |
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