304H High Temperature Boiler Castings
304H High-Temperature Boiler Special-Shaped Castings
Product Overview
Manufactured from high-carbon ZG08Cr19Ni10 (CF8C) austenitic stainless steel, our 304H castings are designed for supercritical/ultra-supercritical boiler components with continuous service up to 700℃.
Key Features
✔ High-Temperature Performance
Oxidation rate ≤2g/m²·h @700℃
Elevated temperature strength ≥100MPa
Creep rupture strength ≥60MPa @650℃/100kh
✔ Material Optimization
C content 0.04-0.10% (carbide strengthening)
Grain size 5-7 (ASTM E112)
Nb/Ti microalloying
Product Series
✓ Superheater hanger assemblies
✓ Reheater transition pieces
✓ Burner nozzle castings
✓ Steam separator complex housings
✓ Boiler sealing rings/brackets
Technical Data
|
Parameter |
Value |
Standard |
|
Tensile |
≥515MPa |
ASTM A351 |
|
Yield @700℃ |
≥110MPa |
GB/T 2039 |
|
Elongation |
≥35% |
ASTM A370 |
|
Hardness |
HB≤200 |
ASTM E10 |
Special Processes
▸ Casting
Investment casting (CT6 tolerance)
Directional solidification
▸ Heat Treatment
Solution annealing (1100℃±10℃ WQ)
Stabilization (900℃×4h)
Quality Control
Material Tests:
✓ OES analysis (precise C control)
✓ Metallography (σ-phase≤0.5%)
Product Tests:
✓ 3D scanning (≤0.5mm vs CAD)
✓ PT (ASTM E165 L1)
Certifications
✓ ASME Section I Stamp
✓ EN 10204 3.1 Certificate
✓ Third-party HT test reports
Premium Heat & Corrosion Resistant Alloys Portfolio
|
Material Grade |
Int'l Standards |
Max Temp. |
Key Advantages |
|
ZG40Cr25Ni20Si2 |
ASTM HK40 / EN 1.4848 |
1100°C |
Top choice for ethylene cracking tubes |
|
ZG40Cr25Ni35Nb |
Modified HP-Nb / EN 1.4852 |
1150°C |
Carburization resistance + Creep rupture strength ≥18MPa |
|
ZG1Cr28Co50 |
DIN 2.4778 (CoCr28) |
1200°C |
Sulfidation resistance for syngas environments |
|
ZG40Cr28Ni48W5 |
EN 2.4879 |
1150°C |
Tungsten-enhanced for glass industry |
|
ZG08Cr19Ni11 (304 equiv.) |
ASTM CF-8 / EN 1.4308 |
400°C |
Cost-effective for moderate tempe |
Note:
Customized heat treatment available
Non-destructive testing packages
Dimensional inspection reports
On-site technical support
fAQ
Q: Do you have automatic or semi-automatic production lines?
Q: How do you ensure dimensional accuracy?
Q: Can you cast both ferrous and non-ferrous alloys?
Q: What is your maximum casting weight capacity?
Q: Are your casting processes environmentally friendly?
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