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| Brand Name: | Torich |
| Model Number: | GB9948 |
| MOQ: | 2 tons |
| Price: | negotiable |
| Payment Terms: | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability: | 20000 Tons per Year |
GB9948 20# Alloy Carbon Pipe Petroleum Cracking Seamless Steel Tube
Production Method of Steel:
High quality carbon sructural steel and alloy structural steel should be handled through electric arc furnace and refining outside the furnace and vacuum refining processing.,also can be producetd by electroslag heavy solvent method.Stainless steel should use electric arc furnace and refining outside the furnace or oxygen converter refining outside the furnace,also can be producetd by electroslag heavy solvent method.
Production Method of Steel:
Hot Rolling(Extrusion,Expansion)or Cold Drawn(Rolling).
Size:
OD:20-500mm
WT:2-50mm
Length:4-12m
Delivery State:
Steel pipes should be delivery with hot treatment state.
Application:
Petrochemical industry furnace tube
Heat exchanger tube
Seamless steel tube for pressure pipe use
The Tolerances of Outer Diameter and Wall Thickness Unit:mm
| Sort Code | Manufacuring Method | Nominal Size | Tolerances | ||
| Common Level | High Level | ||||
| W-H | Hot Rolling (Extrusion) | Outer Diameter D | ≤54 | ±0.50 | ±0.30 |
| >54~325 | ±1%D | ±0.75%D | |||
| >325 | ±1%D | - | |||
| Wall Thicknass S | ≤20 | +15%S -10%S | ±10%S | ||
| >20 | +12.5%S -10%S | ±10%S | |||
| Hot Expand | Outer Diameter D | All | ±1%D | ||
| Wall Thicknass S | All | ±15%S | |||
| W-C | Cold Drawn(Rolling) | Outer Diameter D | ≤25.4 | ±0.15 | |
| >25.4~40 | ±0.20 | ||||
| >40~50 | ±0.25 | ||||
| >50~60 | ±0.30 | ||||
| >60 | ±0.75%D | ±0.5%D | |||
| Wall Thicknass S | ≤3.0 | ±0.3 | ±0.2 | ||
| >3.0 | ±10%S | ±7.5%S | |||
Testing items and sampling quantity of steel tubes
| Number | Testing items | Sampling quantity |
| 1 | Chemical composition | 1 sample from each furnace |
| 2 | Tensile test | 1 sample from each of two steel tubes on each batch |
| 3 | Hardness test | 3 samples taken on 2 steel tubes on each batch |
| 4 | Impact test | All |
| 5 | Hydraulic test | 1 sample from each of two steel tubes on each batch |
| 6 | Flattening test | 2 samples taken on 2 steel tubes on each batch |
| 7 | Bending test | 1 sample taken on 2 steel tubes on each furnace |
| 8 | Flaring test | 2 samples taken on 2 steel tubes on each batch |
| 9 | Macroscopic examination | 1 sample taken on 2 steel tubes on each furnace |
| 10 | Non-metallic inclusions | 1 sample taken on 2 steel tubes on each furnace |
| 11 | Eddy current testing | All |
| 12 | Magnetic flux leakage detection | All |
| 13 | Ultrasonic testing | All |
| 14 | Intergranular corrosion test | 1 sample from each of two steel tubes on each batch |
