TORICH GB/T 3091 Q195 Q215A/B Q235A/B Welded Steel Tube for Low Pressure Liquid Delivery
Product Details
welded steel pipe
,welding steel tubing
TORICH GB/T 3091 Q195 Q215A/B Q235A/B Welded Steel Tube for Low Pressure Liquid Delivery
Spec:
Material:Q195 Q215A/B Q235A/B Q295A/B Q345A/B equivalent to steel grade st33 Cr.B Cr.58 Cr.D
DIN S185 SS330 SS400 etc
Size Range:OD:3-420mm
WT:0.5-50mm
General Length:3-12m
Tolerance:
According to the following tables or customers’ request.
Characteristic:
Mechanical property
Weight coefficient of galvanized coat
Processing: Steel pipe shall be processed eith anyone of longitudinal-seam high-frequency electrical resistance welding, longitudinal-seam submerged arc welding and spiral-seam submerged arc welding.
Technical Delivery Conditions:Steel pipes shall be delivered in welded state. Longitudinal-seam high-frequency electrical resistance welded steel pipe may be delivered in welded seam treatment conditon. According to requirement of demand side, and through negotiation between both supply and demand side, steel pipe also may be delivered in bulk heat treament state and that shall be indicated in contract.
Widely used in the field of:For water,gas,oil,air and heating steam transporting or other use
TABLE 2 Allowable deviation of outer diameter and wall thickness
Unit: millimeter
| Nominal outside diameter D | Allowable deviation of outer diameter | Permissible deviation of wall thickness |
| D≤48.3 | ±0.50 | ±10%S |
| 48.3＜D≤273 | ±1%D | |
| D＞273 | ±0.75%D |
TABLE 3 Mechanical Property
| Grade | Tensile strength N/m | Lower yield strength/ N/m | Elongation A% Not less than | |
| D≤168.3 | D＞168.3 | |||
| Q235A,Q235B | 375 | 235 | 15 | 20 |
| Q295A,Q295B | 390 | 295 | 13 | 18 |
| Q345A,Q345B | 470 | 345 | 13 | 18 |
| Note : Tensile test arbitration time is based on longitudinal sample. | ||||
TABLE 4 Inspection items, test methods and sampling number of steel pipes
| NO | Inspection project | Sampling method and test method | Sampling quantity |
| 1 | chemical composition | GB/T 20066,GB/T 223,GB/T 4336 | One each furnace(canister) |
| 2 | Tensile test | GB/T 228,GB/T 2975 | One each batch |
| 3 | Tensile test | GB/T 241 | One by one |
| 4 | Ultrasonic examination | GB/T18256 | One by one |
| 5 | Eddy current flaw detection | GB/T 7735 | One by one |
| 6 | Bending test | GB/T 244 | Two per batch |
| 7 | Flattening test | GB/T 246 | Four each roll |
Product Images:
QUALITY CONTROL
1~ Incoming Raw Material Inspection
2~ Raw Material Segregation to avoid steel grade mix-up
3~ Heating and Hammering End for Cold Drawing
4~ Cold Drawing and Cold Rolling, on line inspection
5~ Heat Treatment, +A, +SRA, +LC, +N, Q+T
6~ Straightening-Cutting to specified length-Finished Measuring Inspection
7~ Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8~ Packing and Stocking.
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.
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