ASTM A204 Grade A/B/C Molybdenum Alloy Steel Plate: High-Temperature Performance & ASME Certification
Material Overview & Core Advantages
ASTM A204 defines molybdenum-alloy pressure vessel steels engineered for 450°C high-temperature service in boilers and hydrocarbon processing. With tensile strengths from 485 MPa (Grade A) to 655 MPa (Grade C), these normalized plates comply with ASME Section VIII for critical containment systems.
Key Benefits:
- Creep Resistance: 0.5% deformation after 10,000h at 400°C.
- Global Equivalents: EN 10028-2 P355GH (Grade B), JIS G3115 SPV450 (Grade C).
- Fabrication Efficiency: 25% faster welding vs. chromium-moly steels.
Technical Specifications
1. Chemical Composition (ASTM A204M Standard)
| Grade | C Range | Mo Content | CEV* | Max Thickness |
|---|---|---|---|---|
| Grade A | 0.18–0.25% | 0.45–0.60% | 0.52 | 150mm |
| Grade B | 0.20–0.27% | 0.45–0.60% | 0.56 | 200mm |
| Grade C | 0.23–0.28% | 0.45–0.60% | 0.61 | 250mm |
| *CEV = C + (Mo + V)/5 + (Si + Mn)/6 |
2. Mechanical Properties
| Grade | Yield (MPa) | Tensile (MPa) | Elongation (%) | Impact (0°C) |
|---|---|---|---|---|
| Grade A | 255 | 485–620 | 23 | 28 J |
| Grade B | 275 | 515–655 | 21 | 32 J |
| Grade C | 295 | 515–655 | 20 | 35 J |
Physical Properties:
- Density: 7.80 g/cm³ (0.282 lb/in³)
- Thermal Expansion: 13.2 µm/m·°C (20–300°C)
Production & Fabrication
1. Manufacturing Methods
- Normalizing: 900–940°C treatment (mandatory for Grade C).
- Post-Forming Stress Relief: 600–650°C × 1hr/25mm (ASME VIII).
2. Surface Treatments
| Process | Technical Parameters | Industry Use Case |
|---|---|---|
| Shot Blasting | SA 2.5 finish (ISO 8501-1) | Petrochemical reactors |
| Hot-Dip Galvanizing | 85µm Zn coating (ASTM A123) | Offshore platforms |
Industrial Applications
1. Energy Sector
- Power Plant Boilers: Grade B plates (thickness 30–80mm, PWHT required).
- Steam Turbine Casings: Grade C forged shells (CEV ≤0.61).
2. Oil & Gas Processing
| Component | Material Grade | Operational Limits |
|---|---|---|
| Hydrocracker Reactors | Grade C | 420°C @ 18MPa |
| CO2 Absorbers | Grade A | 280°C @ 12MPa |
3. Chemical Equipment
- Autoclave Chambers: Grade A seamless drums (ASME U Stamp).
- Catalyst Baskets: Grade B perforated plates (hole tolerance ±0.1mm).
Quality Assurance
- Testing Protocols:
- Ultrasonic testing (SA-435 Level III for Grade C).
- Hardness verification: HB 140–200 (Grade A/B), HB 160–220 (Grade C).
- Certifications:
- ASME Section II Part A.
- PED 2014/68/EU Annex II.
Delivery & Storage
- Dimensions:
- Width: 1,500–3,000mm (max length: 18m).
- Thickness tolerance: ±0.3mm (cold-rolled), ±0.9% (hot-rolled).
- Packaging: VCI-coated steel straps + desiccant (24-month corrosion protection).
Welding Advisory: Use AWS A5.28 ER90S-B3L filler metal with 120–150°C preheat for Grade C
Scope of Application
ASTM A204 boiler vessel plate is widely used in petroleum, chemical industry, power station, boiler and other industries, used in the manufacture of reactors, heat exchangers, separators, spherical tanks, liquefied gas, nuclear reactor pressure vessels, boiler drum steam, liquefied petroleum gas, hydropower stations, high pressure pipelines, etc.
| 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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