ASTM A135
- Nominal Diameter: 1/2″ to 26″ (DN15-DN650)
- Outside Diameter Tolerance: ±0.8% (≤4″ pipe), ±1% (＞4″ pipe)
- Steel Grade: Grade A, Grade B
- Melting Point: Approx. 1538°C (Carbon Steel)
- Surface Finish: Galvanized
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ASTM A135, an American Standard Electric Resistance Welded (ERW) carbon steel pipe, is designed for use in low-pressure fluid transfer systems, where the galvanized coating provides basic corrosion protection, but the zinc coating oxidizes and fails at elevated temperatures. Pipe fittings experience yield strength decay above 300°C, and at 500°C the residual strength is less than 40% of room temperature, relying on external fire protection coatings to achieve fire resistance integrity.
ASTM A135 Steel Pipe Specification
Chemical Composition Analysis
- Carbon (C) ≤0.30%
- Manganese (Mn) 0.30-1.00%
- Phosphorous (P) ≤0.035%
- Sulfur (S) ≤0.035%
ASTM A135 Steel Pipe Size Charts
Weight calculation basis: carbon steel density 7.85g/cm³, formula: W = 0.02466 × wall thickness × (OD – wall thickness)
Sch Grade Definition: Sch5s/Sch10s for thin-walled tubes, Sch40/Sch80 for regular/thickened tubes
| NPS | DN (mm) | O.D. (mm) | Thickness (mm) | Weight (kg/m) |
| 1/2″ | 15 | 21.3 | Sch5s: 1.65 | 1.03 |
| Sch10: 2.11 | 1.26 | |||
| Sch40: 2.77 | 1.68 | |||
| Sch80: 3.73 | 2.17 | |||
| 3/4″ | 20 | 26.7 | Sch5s: 1.65 | 1.25 |
| Sch10: 2.11 | 1.53 | |||
| Sch40: 2.87 | 2.04 | |||
| Sch80: 3.91 | 2.72 | |||
| 1″ | 25 | 33.4 | Sch5s: 1.65 | 1.59 |
| Sch10: 2.77 | 2.17 | |||
| Sch40: 3.38 | 2.63 | |||
| Sch80: 4.55 | 3.47 | |||
| 1.5″ | 40 | 48.3 | Sch5s: 1.65 | 2.28 |
| Sch10: 2.77 | 3.16 | |||
| Sch40: 3.68 | 4.14 | |||
| Sch80: 5.08 | 5.61 | |||
| 2″ | 50 | 60.3 | Sch5s: 1.65 | 2.86 |
| Sch10: 2.77 | 3.97 | |||
| Sch40: 3.91 | 5.52 | |||
| Sch80: 5.54 | 7.43 | |||
| 2.5″ | 65 | 73 | Sch40: 5.16 | 5.51 |
| Sch80: 7.01 | 7.82 | |||
| 3″ | 80 | 88.9 | Sch10: 3.05 | 6.46 |
| Sch40: 5.49 | 11.26 | |||
| Sch80: 7.62 | 15.24 | |||
| 4″ | 100 | 114.3 | Sch5s: 3.05 | 8.38 |
| Sch10: 3.05 | 8.38 | |||
| Sch40: 6.02 | 16.05 | |||
| Sch80: 8.56 | 22.23 | |||
| 6″ | 150 | 168.3 | Sch5s: 3.40 | 13.81 |
| Sch10: 4.50 | 18.26 | |||
| Sch40: 7.11 | 28.32 | |||
| Sch80: 10.97 | 42.55 | |||
| 8″ | 200 | 219.1 | Sch5s: 3.76 | 19.92 |
| Sch10: 6.35 | 33.41 | |||
| Sch40: 8.18 | 42.77 | |||
| Sch80: 12.70 | 64.89 | |||
| 10″ | 250 | 273 | Sch5s: 4.19 | 27.76 |
| Sch10: 6.35 | 41.82 | |||
| Sch40: 9.27 | 60.45 | |||
| Sch80: 12.70 | 81.91 | |||
| 12″ | 300 | 323.8 | Sch5s: 4.57 | 36.01 |
| Sch10: 6.35 | 49.83 | |||
| Sch40: 9.53 | 74.08 | |||
| Sch80: 14.27 | 109.32 | |||
| 24″ | 600 | 609.6 | Sch10: 9.53 | 141.1 |
| Sch40: 17.48 | 255.67 |
Temperature - Working Pressure
ASTM A135 Steel Pipe Process & Quality
ASTM A135 Steel Pipe Process
ASTM A135 is American Standard welded steel pipe, the core process is high frequency resistance welding technology.
The post-welding heat treatment process adopts normalizing treatment, the temperature is: 900 ± 20 ℃, can eliminate welding residual stress, decomposition of untempered martensite, enhance the toughness of the weld.
ERW process in the field of low-pressure transmission with significant cost-effective, but high-temperature and high-pressure conditions require the use of seamless pipe.
Comparison of ERW and SMLS processes- ASTM A135 vs ASTM A106
| Characteristic | ASTM A135 (ERW) | ASTM A106 (Seamless) |
| Weld Configuration | Longitudinal straight seam | No weld seam |
| Production Efficiency | 30-120 m/min (continuous line) | 2-8 m/min (rotary piercing) |
| Material Utilization | >98% (coil-fed) | ≈85% (billet-based) |
| Wall Thickness Tolerance | ±12.5% | ±10% |
| Cost Factor | Low (30-40% savings vs. seamless) | High (energy-intensive process) |
| Temperature Limit | ≤300°C (with derating) | ≤400°C |
| Pressure Limit | ≤10 MPa (Sch80) | ≤25 MPa (Sch160) |
ASTM A135 Steel Pipe Quality
1. Outer diameter tolerance: ≤±0.8% (DN≤100mm)
2. Water pressure test: ≥2.5 times the working pressure, holding pressure for 10 seconds.
3. Non-destructive testing: ECT (10kHz-1MHz) or UT (5MHz)
4. Galvanized: zinc layer thickness ≥85μm
5. Flattening test: the distance between the pressure plate = 3 × wall thickness, no crack is qualified.
6. End face treatment: flat chamfering processing, bevel angle 30 ° ± 2 °