Cold Drawn Precision Steel Tube Seamless 2 - 12m Length With GB/T3639
Cold Drawn Precision Steel Tube Seamless 2 - 12m Length With GB/T3639
Steel Grade/Steel Material:10#, 20#, 45#, 16Mn, SAE1010, SAE1020, SAE1045, SKTM11, ST35, ST52 etc
Steel pipe standard:GB8713, GB3639, DIN2391, EN10305-1, EN10305-4, JIS-G3445, ASTM A519, etc
Size:OD:10.00—110.00mm, WT:1.00—8.00mm, Length: 5.8m, 6m,9m,or as required.
Technique: 1) Cold Rolled 2) Cold Drawn
Characteristic: Good concentricity, Good OD and ID tolerance, High Precision, Stable quality, Smooth Roughness
Application: 1) shock absorber for motorcycle and automobile, 2) hydraulic gas cylinder
3) precision machine precision pipe part, 4) other auto pipe parts
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
| Steel grade | Minimum values for the delivery condition | ||||||||||||
| +CC | +LCC | +SR | +Ad | +N | |||||||||
| steel name | steel number | Rm MPa | A % | Rm MPa | A % | Rm Mpa | ReH MPa | A % | Rm MPa | A % | Rm MPa | ReHC MPa | A % |
| E155 | 1.0033 | 400 | 6 | 350 | 10 | 350 | 245 | 18 | 260 | 28 | 270 to 410 | 155 | 28 |
| E195 | 1.0034 | 420 | 6 | 370 | 10 | 370 | 260 | 18 | 290 | 28 | 300 to 440 | 195 | 28 |
| E235 | 1.0908 | 490 | 6 | 440 | 10 | 440 | 325 | 14 | 315 | 25 | 340 to 480 | 235 | 25 |
| E275 | 1.0225 | 560 | 5 | 510 | 8 | 510 | 375 | 12 | 390 | 21 | 410 to 550 | 275 | 21 |
| E355 | 1.0580 | 640 | 4 | 590 | 6 | 590 | 435 | 10 | 450 | 22 | 490 to 630 | 355 | 22 |
| a. Rm: tensile strength ; ReH: upper yield strength (but see 11.1); A: elongation. For symbols for the delivery condition see Table 1. | |||||||||||||
| b. 1 Mpa = 1 N/mm2 | |||||||||||||
| c. Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strengths. For calculation purposes the following relations are recommended: | |||||||||||||
| —— For delivery condition +C: ReH ≥0.8 Rm | |||||||||||||
| —— For delivery condition +LC: ReH ≥0.7 Rm | |||||||||||||
| d. For calculation purposes the following relations is recommended: ReH ≥0.5 Rm | |||||||||||||
| e. For tubes with outside diameter ≤ 30 mm and wall thickness≤ 3mm, the ReH minimum values are 10 Mpa lower than the values given in this Table. | |||||||||||||
Production of Precision Steel Tube:
Eddy Current Test and Ultrasonic Test:
Packing and delivery:
Our Certifications
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
Q: Are you trading company or manufacturer ?
A: A professional steel pipes materials inventor, manufacturer and solution provider
Q: How long is your delivery time?
A: Generally it is 7-14 days if the goods are in stock. or it is 30-60 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples of carbon seamless steel tube ? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
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