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Precision cold drawn tube (precision cold drawn tube) is a high-precision steel pipe material that uses seamless cold drawn tube as raw material for tolerance control and surface gloss processing
Precision cold drawn pipes have the characteristics of high precision, high smoothness, good inner wall cleanliness, steel pipes can withstand high pressure without leakage, cold bending without deformation, expansion and flattening without cracks, and can undergo various complex deformations and mechanical processing treatments. The chemical composition of precision cold drawn tubes includes carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr
Main applications: for automobiles, motorcycles, refrigeration equipment, hydraulic components, bearings, pneumatic cylinders, and other customers with high requirements for steel pipe accuracy, smoothness, cleanliness, and mechanical performance
GB/T 3639 DIN2391 ASTM A519 EN 10305 JIS 3445 etc.
The following are the parameters and commonalities of standards in various countries
| Size tolerance | |||||
| OD | Standard tolerance | Special tolerance | |||
| Outer Diameter | GB/T3639 | DIN2391 | EN10305 | O D | thickness |
| 4mm-20mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.05mm | ±0.05mm |
| 20mm-30mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm |
| 31mm-40mm | ±0.15 mm | ±0.15 mm | ±0.15 mm | ±0.10 mm | ±0.08 mm |
| 41mm-60mm | ±0.20 mm | ±0.20 mm | ±0.20 mm | ±0.15 mm | ±0.15 mm |
| 61mm-80mm | ±0.30 mm | ±0.30 mm | ±0.30 mm | ±0.20 mm | ±0.20 mm |
| 81mm-120mm | ±0.45 mm | ±0.40 mm | ±0.40 mm | ±0.30 mm | ±0.30 mm |
| Equivalent Material referance: | ||||||
| GB | TOCT | ASTM | BS | JIS | NF | DIN |
| 10F | 1010 | 040A10 | XC10 | |||
| 10 | 10 | 10,101,012 | 045M10 | S10C | XC10 | C10,CK10 |
| 20 | 20 | 1020 | 050A20 | S20C | XC18 | C22,CK22 |
| 45 | 45 | 1045 | 080M46 | S45C | XC45 | C45,CK45 |
| 30CrMo | 30XM | 4130 | 1717COS110 | SCM420 | 30CD4 | |
| 42CrMo | 4140 | 708A42 | 42CD4 | 42CrMo4 | ||
| 708M40 | ||||||
| 35CrMo | 35XM | 4135 | 708A37 | SCM3 | 35CD4 | 34CrMo4 |
| GB | ASTM/ASME | DIN | EN | JIS | |||||
| GB/T8162 | 10 | A53 | A | DIN1629 | St37 | EN17121 | St37-2/3 | G3454 | STPG370 |
| GB/T8163 | A106 | A | |||||||
| GB/T3639 | A519 | 1010 | |||||||
| 20 | A53 | B | DIN1629 | St44 | EN17121 | St44-2/3 | G3454 | STPG410 | |
| A106 | B | ||||||||
| A519 | 1020 | ||||||||
| 45 | A1045 | CK45 | |||||||
| Q235 | A519 | 1021 | EN10210-1 | S235JRH | G3444 | STK400 | |||
| EN1097-1 | E235 | ||||||||
| Q345 | A519 | 1524 | DIN1629 | St52 | G3444 | STK500 | |||
| 37Mn5 | J55 | ||||||||
| 35CrMo | 4135 | G4105 | SCM435 | ||||||
| 20Cr | 5120 | SCr420 | |||||||
| 40Cr | 5140 | SCr440 | |||||||
| 15CrMo | SCM415 | ||||||||
| 20CrMo | 4119 | SCM420 | |||||||
| 42CrMo | 4150/4142 | SCM440 | |||||||
| 20CrMnTi | SMK22 | ||||||||
| tandard | Grade | Chemical composition:(%) | |||||||||||
| C | Si | Mn | P≤ | S≤ | Cr | Mo | Cu≤ | Ni≤ | Ti | V | Nb | ||
| GB/T 699 | 10 | 0.07~0.13 | 0.17~0.37 | 0.35~0.65 | 0.035 | 0.035 | ≤0.15 | 0.25 | 0.3 | ||||
| 20 | 0.17~0.23 | 0.17~0.37 | 0.35~0.65 | 0.035 | 0.035 | ≤0.35 | 0.25 | 0.3 | |||||
| 35 | 0.32~0.39 | 0.17~0.37 | 0.50~0.80 | 0.035 | 0.035 | ≤0.25 | 0.25 | 0.3 | |||||
| 45 | 0.42~0.50 | 0.17~0.37 | 0.50~0.80 | 0.035 | 0.035 | ≤0.25 | 0.25 | 0.3 | |||||
| GB/T3077 | 20Cr | 0.18~0.24 | 0.17~0.37 | 0.50~0.80 | 0.035 | 0.035 | 0.70~1.00 | ||||||
| 40Cr | 0.37~0.44 | 0.17~0.37 | 0.50~0.80 | 0.035 | 0.035 | 0.80~1.10 | |||||||
| 20CrMo | 0.17~0.24 | 0.17~0.37 | 0.40~0.70 | 0.035 | 0.035 | 0.80~1.10 | 0.15~0.25 | ||||||
| 42CrMo | 0.38~0.45 | 0.17~0.37 | 0.50~0.80 | 0.90~1.20 | 0.15~0.25 | ||||||||
| 20CrMnTi | 0.17~0.23 | 0.17~0.37 | 0.80~1.10 | 1.00~1.30 | 0.04 | ||||||||
| ~0.10 | |||||||||||||
| steel grade | +C(BK) | +LC(BKW) | +SR(BKS) | +A(GBK) | +N(NBK) | |||||||
| Rm(Mpa) | A(%) | Rm(Mpa) | A(%) | Rm(Mpa) | Reh(Mpa) | A(%) | Rm(Mpa) | A(%) | Rm(Mpa) | Reh(Mpa) | A(%) | |
| 10 | 430 | 8 | 380 | 10 | 400 | 300 | 16 | 335 | 24 | 320~450 | 215 | 27 |
| 20 | 550 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440~570 | 255 | 21 |
| 35 | 590 | 5 | 550 | 7 | - | - | - | 510 | 17 | ≥460 | 280 | 21 |
| 45 | 645 | 4 | 630 | 6 | - | - | - | 590 | 14 | 540 | 340 | 18 |
| 25Mn | 650 | 6 | 580 | 8 | 580 | 450 | 10 | 490 | 18 | - | - | - |
| Q355B | 640 | 4 | 580 | 7 | 580 | 450 | 10 | 450 | 22 | 490~630 | 355 | 22 |
| Q420B | 750 | 4 | 620 | 8 | 690 | 590 | 12 | 520 | 22 | 550~700 | 425 | 22 |
| 25CrMo | 720 | 4 | 670 | 6 | - | - | - | - | - | - | - | - |
| 42CrMo | 720 | 4 | 670 | 6 | - | - | - | - | - | - | - | - |
| Material | 10#-45#, 16Mn, A53-A369, Cr-Mo alloy, Q195-Q345, ST35-ST52, 10#, 20#, 45#, 16Mn, A213, A315, 30CrMo, Q195, Q215, Q235, Q345, ST35, St37, St45, St52 |
| Surface | Black/ Bright |
| Standard | DIN, GB, JIS, DIN 17175, DIN 2391, GB 5310-1995, GB/T 13793-1992, GB/T 3094- 2000, GB/T 8163-1999, JIS G3101 |
| Size | OD 15mm-70mm |
| Thickness 1-12mm | |
| Processing | Cold rolled/ Cold drawn |
| 1. BK (+C) No heat treatment after last cold forming process. | |
| 2. BKW (+LC) After last heat treatment there is a light finishing pass ( cold drawing) | |
| 3. BKS (+SR) After the final cold forming process the tubes are stress relieve annealed. | |
| 4. GBK (+A) After the final cold forming process the tubes are annealed in a controlled atmosphere. | |
| 5. NBK (+N) After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere. | |
| Packing | Woven bag/ Wooden or crate carton/ Bundle Packing/ Plain end or vanished as per customer's request. |
| Delivery time | Normally 30-40 working days |
Q: Are you trading company or manufacturer?
A: We are professional manufacturer for steel pipes,and our company also is a very professional and technical foreign trade company for steel products. We have more export experience with competitive price and best after-sales service. Apart from this,we can provide a wide range of steel products to meet the requirement of customer.
Q:Will you delivery the goods on time?
A: Yes,we promise to provide best quality products and delivery on time no matter if the price change lot or not. Honesty is our company's tenet.
Q: Do you provide samples ? is it free or extra?
A: The sample could can provide for customer with free,but the freight will be covered by customer account. The sample freight will be returned to customer account after we cooperate.
Q: How can I get your quotation as soon as possible?
A: The email and fax will be checked within 24 hours,meanwhile,Wechat and WhatsApp will be online in 24 hours. Please send us your requirement and order information,specification(Steel grade,size,quantity,destination port),we will work out a best price soon.
Q: Do you have any certifications?
A: Yes,that's what we guarantee to our clients. we have IS09000,IATF16949 certinicate,ISO 14001 certificates etc.Our products are of high quality and we have professional engineers and development team.
Q: What is your terms of payment?
A:Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipmenit or paid against copy of B/L within 5 working days. 100% Irrevocable L/C at sight is favorable payment term as well.
Q: Do you accept the third party inspection?
A: Yes absolutely we accept.
