TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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GB/T 5312 Carbon and Carbon-Manganese Steel Seamless Steel Tubes and Pipes for Ship
Material:320/360/410/460/490 and so on.
OD:3-420mm
WT:0.5-50mm
Length:3-12m
Characteristic:
Good concentricity
Good OD and ID tolerance
High Precision
Stable quality
Smooth Roughness
TORICH QUALITY ASSURANCE
Production Processs:
RAW MATERIAL
↓
INCOMING INSPECTION
↓
STORAGE → CUTTING→HAMMERING → PICKING LUBRICATION → CLEANING → PHOSPHORI CLEAN
↓
ENDS CUTTING←STRAIGHTENING←HEAT TREATMENT↔MIDDLLE CHECK↔ COLD DRAWING ← LUBRICATING
↓
FINAL INSPECTION→BUNDING→STORAGE
Tolerance:
According to the following tables or customers’ request.
| Production Method | Size(mm) | Tolerance | |
|
OD | ≤159 | ±1.0%(min.±0.50mm) |
| >159 | ±1.25% | ||
|
≤20 | +15%(min.+0.45mm) -10%(min. -0.30mm) | |
| >20 | ±10% | ||
| D≥351 | ±15% | ||
Cold Drawn | | ≤30 | ±0.20mm |
| 30~50 | ±0.30mm | ||
| >50 | ±0.8% | ||
|
1.5~3 | +12.5% -10% | |
| >3.0 | ±10% | ||
Mechnical Property
| Steel Grade | Tensile Strength MPa | Yield Strength MPa | Elongation % |
| 320 | 320-440 | ≥195 | ≥25 |
| 360 | 360-480 | ≥215 | ≥24 |
| 410 | 410-530 | ≥235 | ≥22 |
| 460 | 460-580 | ≥265 | ≥21 |
| 490 | 490-610 | ≥285 | ≥21 |
Producing Method: Hot rolling(extrusion), Cold drawn, Cold rolling.
Technical Delivery Conditions: Normalized(NBK)or Normalized and tempered
Widely used in the field of: For ship pressure pipe system, boiler and superheater (Seamless high pressure boiler tube)
Steel pipe standard:
1. ASTM:ASTM A106GR.A; ASTM A106GR.B; ASTM A53GR.A; ASTM A53GR.B;
ASTM A333; ASTM A334; ASTM A192; ASTM A210;
2. JIS: G3452;G3457; G3454; G3456; G3461; G3454; G3455;
STPG38; STPG38; STS38; STPT42; STB42; STS42; STS49; STPT49
3. DIN:ST33;ST38ST35;ST42;ST45;ST52.4;ST52; TT St35N;10Ni14;15Mo3
