| Customization: | Available |
|---|---|
| After-sales Service: | Offer |
| Warranty: | Offer |
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Engineered Steam Conveyance Solution for Critical Refinery Services
Designed for high-pressure steam transfer in petrochemical facilities, our seamless pipes deliver superior thermal stability and creep resistance. With controlled carbon-manganese chemistry and normalized microstructure, this SCH40 wall thickness system maintains structural integrity at 425°C continuous service - outperforming ERW and carbon steel alternatives.
Key Performance Advantages
High-Temperature Capability
Sustained Operation: 425°C (ASME B31.1 Table A-1)
Oxidation Resistance: ≤0.1mm/year scale formation @ 480°C
Thermal Fatigue Resistance: 2,000+ thermal cycles (200-425°C)
Pressure Integrity
SCH40 Wall Thickness: 8.18mm @ NPS 8 (DN200)
Hydrostatic Rating: 83 bar @ 150°C (per ASME B36.10)
Burst Pressure: ≥220 MPa (31,900 psi)
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | P235GH |
| Dimensions | NPS 1/2" to 24" (SCH40) |
| Material | C≤0.30%, Mn 0.29-1.06%, Si≥0.10% |
| Manufacturing | Hot-finished seamless |
| Heat Treatment | Normalized (900-980°C) |
| Tensile Strength | ≥415 MPa (60,200 psi) |
| Yield Strength | ≥240 MPa (34,800 psi) |
| Hardness | ≤197 HB |
| Certifications | PED 2014/68/EU Cat. IV, NACE MR0175 |
Refinery Steam Service Performance
| Service Condition | Performance Metric | Result |
|---|---|---|
| 400°C Saturated Steam | Creep Rate (100,000h) | 0.0001%/h |
| 50 bar @ 350°C | Allowable Stress (ASME) | 99.3 MPa (14,400 psi) |
| H2S Environment (50ppm) | SCC Resistance | NACE Level 1 |
| Thermal Shock (ΔT 250°C) | Cyclic Performance | >500 cycles |
Refinery Application Benefits
FCC Unit Steam Lines
Resists dew point corrosion (pH 2-4 condensate)
Max intermittent temp: 540°C
Coker Blowdown Systems
Thermal shock tolerance: 200°C/min change rate
Erosion resistance: <0.3mm/year @ 30m/s flow
Turbine Bypass Piping
ASME B31.1 Category D service
Vibration fatigue strength: 80 MPa at 10e7 cycles
Heat Recovery Steam Generators
Thermal expansion coefficient: 12.3 μm/m·°C
Thermal conductivity: 43 W/m·K @ 400°C
Competitive Comparison
| Property | A106 Gr.B SCH40 | API 5L Gr.B | 304H Stainless |
|---|---|---|---|
| Max Operating Temp | 540°C | 400°C | 650°C |
| 500°C Allowable Stress | 52 MPa | 38 MPa | 78 MPa |
| Cost per Meter (NPS 8) | $120-150 | $90-110 | $280-350 |
| Weldability | Excellent | Excellent | Moderate |
| 20-Year Lifecycle Cost | $8.2/m/year | $11.5/m/year | $16.8/m/year |
Fabrication & Installation
Welding: E7018 electrode, PWHT @ 595-650°C for t>19mm
Support Spacing: 4.5m max @ 400°C (ASME B31.1 Table 121.5)
Insulation: Calcium silicate @ 400°C service (ASTM C533)
Flange Connection: ASME B16.5 Class 300 RF
Quality Assurance
Mill Certification: EN 10204 3.2 with full traceability
Dimensional Compliance:
OD Tolerance: ±0.79mm (NPS 8)
Wall Variation: ≤10% nominal
Straightness: ≤1.6mm/m
Testing:
Hydrostatic: 70 bar for 10s (ASTM A106)
Ultrasonic Testing: 100% coverage per ASTM A106
Hardness Mapping: ≤22 HRC HAZ
Technical Support
Our engineers provide:
Stress Analysis (CAESAR II AutoPIPE)
Steam Hammer Analysis
PWHT Procedure Qualification
Condensate Corrosion Modeling
Certification Highlights:
ABS Type Approval for Offshore
DNV GL OS-F101 Compliant
ISO 3183 Transportation Safety
IBR Approved (Indian Boiler Regulation)
If you have any questin in steel ,please feel free to contact me !
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