ASTM A213 347/347H Stainless Steel Heat Exchanger Tubes for Oil Industry
High-quality 347H stainless steel seamless tubes offering excellent performance in demanding oil industry applications. These stabilized austenitic stainless steel tubes provide superior resistance to intergranular corrosion and enhanced high-temperature properties.
Product Specifications
Product Name
347H Stainless Steel Seamless Tube
Outside Diameter
1/2" - 24"
Wall Thickness
SCH5, SCH10, SCH40, SCH80, SCH160, XXS
Material Grades
Inconel 904L, 254MO, 317L and other special steels
Raw Material Source
TSING SHAN
Standards
ASTM A312, A269
Length
Custom lengths as requested
Surface Treatment
Annealing, pickling, sandblasting
Dimensional Tolerances
| Parameter |
Tolerance |
| Outer Diameter |
+/- 0.2mm |
| Thickness |
+/- 0.02mm |
| Length |
+/- 5mm |
Quality Assurance & Testing
- Comprehensive in-house inspection team with strict quality standards
- Acceptance of customer and third-party inspections
- Testing includes: Squash test, extended test, water pressure test, heat treatment, NDT
- Large raw material stock ensuring timely order completion
Applications
Industrial, exhausting systems, water treatment, petroleum, chemical processing, nuclear industry, electric power generation, shipbuilding, paper making, food processing, decoration, machinery and construction industries.
Alloy 347/347H Technical Overview
General Properties
Alloy 347 (S34700) is a columbium-stabilized stainless steel offering excellent resistance to intergranular corrosion following exposure to temperatures between 800-1500°F (427-816°C). The alloy provides superior creep and stress rupture properties compared to standard 304 stainless steel, making it ideal for high-temperature applications.
Corrosion Resistance
Excellent resistance to intergranular corrosion in the chromium carbide precipitation range. Performs well in nitric solutions, diluted organic acids, and pure phosphoric acid. Resists polythionic acid stress corrosion cracking in hydrocarbon service. Not recommended for chloride solutions or sulfuric acid applications.
Chemical Composition
| Element |
347 (Weight %) |
347H (Weight %) |
| Chromium |
17.00-19.00 |
17.00-19.00 |
| Nickel |
9.00-13.00 |
9.00-13.00 |
| Carbon |
0.08 max |
0.04-0.10 |
| Manganese |
2.00 max |
2.00 max |
| Phosphorus |
0.045 max |
0.045 max |
| Sulfur |
0.03 max |
0.03 max |
| Silicon |
0.75 max |
0.75 max |
| Columbium & Tantalum |
10×(C+N) min - 1.00 max |
8×(C+N) min - 1.00 max |
| Iron |
Balance |
Balance |
Physical Properties
| Property |
Value |
| Density |
0.288 lbs/in³ (7.96 g/cm³) |
| Specific Heat |
0.12 BTU/lb-°F (500 J/kg-°K) |
| Modulus of Elasticity |
28.0 × 10⁶ psi (193 GPa) |
| Thermal Conductivity (200°F) |
133 BTU/hr/ft²/ft/°F (16.3 W/m-°K) |
| Melting Range |
2550-2635°F (1398-1446°C) |
| Electrical Resistivity |
72 Microhm-cm at 20°F |
Thermal Expansion Coefficients
| Temperature Range |
Mean Coefficient |
| 68-212°F (20-100°C) |
9.2 × 10⁻⁶ in/in°F (16.0 × 10⁻⁶ cm/cm°C) |
| 68-1112°F (20-600°C) |
10.5 × 10⁻⁶ in/in°F (18.9 × 10⁻⁶ cm/cm°C) |
| 68-1832°F (20-1000°C) |
11.4 × 10⁻⁶ in/in°F (20.5 × 10⁻⁶ cm/cm°C) |
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