I. Material Standard (06Cr25Ni20 / UNS S31008)
| C | P | S | |||||
|---|---|---|---|---|---|---|---|
| <=0.08 | <=1.50 | <=2.00 | <=0.035 | <=0.030 | 24.0–26.0 | 19.0–22.0 |
2. Core Performance
Thermal Resistance: 1050℃ (continuous), 1200℃ (intermittent)
Mechanical Properties: Tensile Strength >= 520 MPa, Yield Strength >= 205 MPa, Elongation >= 40%
Processing: 1100–1150℃ Solution Annealing + Water Quenching (to relieve stress and stabilize microstructure)
II. Specifications and Pricing (Large-Diameter, Thick-Walled: Φ426–Φ2000 mm; March 30, 2026)
Standard Diameter · Wall Thickness · Unit Price (CNY/kg; Straight-Seam Double-Sided Welded + Solution Treated + NDT)
| Φ426 | 12/14/16 | 8 | Standard Stock: 6 meters / 12 meters |
| Φ530 | 14/16/18 | 8.5 | |
| Φ630–Φ820 | 16/20/25 | 9 | |
| Φ920–Φ1200 | 20/25/30 | 9 | Custom Thick-Walled |
| Φ1500–Φ2000 | 25/30/40 | 10 | Extra-Large Diameter, Rolled from Steel Plate |
III. Technical Solution (Specialized Process for Large-Diameter, Thick-Walled Pipes)
1. Production Process (Straight Seam Submerged Arc Welding / TIG)
Raw Materials: TISCO / Baosteel 310S Hot-Rolled Coils / Plates (Genuine Cr25Ni20 grade, verified via spectral analysis)
Forming: JCOE / Plate Rolling Machine; ensuring roundness and ovality <= 0.5% of the nominal diameter (D)
Welding: Double-sided automatic submerged arc welding (internal + external welds), utilizing specialized ER310LMo welding wire
Heat Treatment: Full-length solution annealing at 1100–1150℃, followed by rapid water quenching to ensure high-temperature stability
Sizing / Straightening: Internal leveling + external sizing to ensure dimensional precision
2. Quality Inspection (100% Comprehensive Inspection)
Non-Destructive Testing (NDT): X-ray flaw detection (Level II acceptance) + Ultrasonic Testing (UT)
Pressure Testing: Hydrostatic test (P=2SR/D; pressure held for 10 seconds with no leakage)
Dimensions: 100% inspection of outer diameter, wall thickness, length, and straightness
3. Applicable Standards
US Standards: ASTM A312 TP310S, ASME SA312
A: You bet. Strict checks-all pass certifications, reliable stuff.
A: Ask sales.
A: Non-human issues? Contact within 7 days with photos. We'll handle returns/exchanges/repairs.
A: Visa, Mastercard, PayPal, bank transfer-all work. Big orders? We can do prepayment + final payment. Ask sales for details.
A: Yep, each has one. Tricky products? Video guides-just ask customer service.
A: Sturdy boxes with cushioning (fits shipping). Need custom? Just ask.
A: Sure. Send clear logo. Cost depends on size, placement, etc. Sample first-mass produce once you ok it.
Shuangzhong Technology is a professional manufacturer with twenty years of experience. We maintain long-term partnerships with major Chinese enterprises-such as Sinopec and CNPC-and export our products to various countries worldwide.
