TORICH INTERNATIONAL LIMITED
| Steel Grade | Q235A, Q235B; optional Q295A/Q295B/Q345A/Q345B by order |
| Wall Thickness | 0.3–200 mm commercial supply range |
| Heat Treatment | Normally supplied as-welded/as-rolled; heat treatment or stress relief only when specified |
| Outside Diameter | 4–1200 mm commercial supply range |
| Material | Carbon structural steel / low-alloy structural steel |
| OD Tolerance | D ≤ 48.3 mm: ±0.50 mm; 48.3 < D ≤ 273 mm: ±1%D; D > 273 mm: ±0.75%D |
| Length | 1–12 m customized; 4–12 m common supply range |
| Supply Ability | 50000Tons/year |
| Delivery Time | 30 Work Days |
| Packaging Details | In plywood case,In wooden box. |
| Wall Thickness Tolerance | ±10%S |
| Payment Terms | L/C,D/A,D/P,T/T,Western Union,MoneyGram |
| Standard | GB/T 14291 Welded Steel Tubes for Mine Liquid Service |
| Brand Name | TORICH |
| Model Number | GB/T14291 |
| Certification | ISO 9001,ISO 14001,TS 16949 |
| Place of Origin | China |
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Product Specification
| Steel Grade | Q235A, Q235B; optional Q295A/Q295B/Q345A/Q345B by order | Wall Thickness | 0.3–200 mm commercial supply range |
| Heat Treatment | Normally supplied as-welded/as-rolled; heat treatment or stress relief only when specified | Outside Diameter | 4–1200 mm commercial supply range |
| Material | Carbon structural steel / low-alloy structural steel | OD Tolerance | D ≤ 48.3 mm: ±0.50 mm; 48.3 < D ≤ 273 mm: ±1%D; D > 273 mm: ±0.75%D |
| Length | 1–12 m customized; 4–12 m common supply range | Supply Ability | 50000Tons/year |
| Delivery Time | 30 Work Days | Packaging Details | In plywood case,In wooden box. |
| Wall Thickness Tolerance | ±10%S | Payment Terms | L/C,D/A,D/P,T/T,Western Union,MoneyGram |
| Standard | GB/T 14291 Welded Steel Tubes for Mine Liquid Service | Brand Name | TORICH |
| Model Number | GB/T14291 | Certification | ISO 9001,ISO 14001,TS 16949 |
| Place of Origin | China | ||
| High Light | welded steel pipe ，electric resistance welded steel tube | ||
GB/T 14291 Q235 welded steel tubes are straight-seam ERW carbon steel tubes specifically designed for mine liquid and auxiliary fluid service applications. These tubes are engineered for use in mine pressured-air lines, drainage systems, gas-drainage lines, and slurry transportation. Manufactured primarily from Q235A/Q235B mild steel, with optional higher-strength grades including Q295 and Q345 for projects requiring increased yield strength. GB/T 14291 comprehensively defines dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking, and quality certification for this specialized tube category.
| Parameter | Specification |
|---|---|
| Material | Carbon structural steel / low-alloy structural steel |
| Standard | GB/T 14291 Welded Steel Tubes for Mine Liquid Service |
| Steel Grade | Q235A, Q235B; optional Q295A/Q295B/Q345A/Q345B by order |
| Outside Diameter | 4-1200 mm commercial supply range |
| Wall Thickness | 0.3-200 mm commercial supply range |
| Length | 1-12 m customized; 4-12 m common supply range |
| OD Tolerance | D ≤ 48.3 mm: ±0.50 mm; 48.3 < D ≤ 273 mm: ±1%D; D > 273 mm: ±0.75%D |
| Wall Thickness Tolerance | ±10%S |
| Straightness | Commercially controlled for mine pipeline installation; stricter straightness can be agreed in purchase specification |
| Surface Condition | Black, oiled, varnished, painted, or galvanized by agreement |
| Heat Treatment | Normally supplied as-welded/as-rolled; heat treatment or stress relief only when specified |
| Standard System | Applicable Standard | Description |
|---|---|---|
| GB | GB/T 14291 | Primary standard for welded steel tubes used in mine liquid service |
| GB | GB/T 700 | Material reference for Q235 carbon structural steel |
| GB | GB/T 1591 | Material reference for Q295/Q345 low-alloy structural steel |
| ASTM | ASTM A53/A53M | Comparable standard for black or hot-dip galvanized welded/seamless steel pipe |
| EN | EN 10217-1 | Welded non-alloy steel tubes for pressure purposes with specified room-temperature properties |
| JIS | JIS G 3452 | Carbon steel pipe for ordinary piping at comparatively low working pressure |
| GOST | GOST 10705 | Electric-welded steel pipes for pipelines, structures, and general-purpose products |
Underground mine slurry drainage pipeline systems for transporting water mixed with coal fines or mineral particles from working areas to drainage sumps.
| Grade | Standard | C | Si | Mn | P | S | Other Elements |
|---|---|---|---|---|---|---|---|
| Q235A | GB/T 700 | ≤0.22 | ≤0.35 | ≤1.40 | ≤0.045 | ≤0.050 | Rimmed or killed |
| Q235B | GB/T 700 | ≤0.20 | ≤0.35 | ≤1.40 | ≤0.045 | ≤0.045 | Rimmed or killed |
| Q295A | GB/T 1591-1994 | ≤0.16 | ≤0.55 | 0.80-1.50 | ≤0.045 | ≤0.045 | Ti 0.02-0.20; V 0.02-0.15; Nb 0.015-0.060; Cr/Ni/Cu ≤0.30 each |
| Q295B | GB/T 1591-1994 | ≤0.16 | ≤0.55 | 0.80-1.50 | ≤0.040 | ≤0.040 | Ti 0.02-0.20; V 0.02-0.15; Nb 0.015-0.060; Cr/Ni/Cu ≤0.30 each |
| Q345A | GB/T 1591-1994 | ≤0.20 | ≤0.55 | 1.00-1.60 | ≤0.045 | ≤0.045 | Ti 0.02-0.20; V 0.02-0.15; Nb 0.015-0.060; Cr/Ni/Cu ≤0.30 each |
| Grade | Tensile Strength Rm, MPa min. | Lower Yield Strength ReL, MPa min. | Elongation A, % min. D ≤ 168.3 mm | Elongation A, % min. D > 168.3 mm |
|---|---|---|---|---|
| Q235A | 375 | 235 | 15 | 20 |
| Q235B | 375 | 235 | 15 | 20 |
| Q295A | 390 | 295 | 13 | 18 |
| Q295B | 390 | 295 | 13 | 18 |
| Q345A | 470 | 345 | 13 | 18 |
If you have any other questions, please feel free to contact us.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
1997
Total Annual:
25000000-30000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
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