Jiangsu Hongbao Group Co., Ltd.
| Supply Ability | 30000MT per year |
| Delivery Time | Within 50 days if production |
| Packaging Details | Seaworthy plywooden case |
| Payment Terms | L/C,T/T |
| Material | ST37.4, ST52.4, E235, E355, 26MnB5, 34MnB5 |
| Origin | Jiangsu, China |
| OD | 6-120mm |
| Thickness | 0.5-15mm |
| Type | Welded or Seamless |
| Processing | Cold Drawn, Cold Rolled |
| Brand Name | Hongbao |
| Model Number | HBPST-1 |
| Certification | TS16949 |
| Place of Origin | Jiangsu, China |
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Product Specification
| Supply Ability | 30000MT per year | Delivery Time | Within 50 days if production |
| Packaging Details | Seaworthy plywooden case | Payment Terms | L/C,T/T |
| Material | ST37.4, ST52.4, E235, E355, 26MnB5, 34MnB5 | Origin | Jiangsu, China |
| OD | 6-120mm | Thickness | 0.5-15mm |
| Type | Welded or Seamless | Processing | Cold Drawn, Cold Rolled |
| Brand Name | Hongbao | Model Number | HBPST-1 |
| Certification | TS16949 | Place of Origin | Jiangsu, China |
| High Light | Seamless Steel Pipes Honing Tube ，42CrMo4 Seamless Steel Pipes ，St52 Seamless Steel Pipes | ||
Seamless steel tubes, specifically cold drawn precision steel tubes for hydraulic cylinders, are engineered for high performance and durability. These tubes undergo a meticulous cold drawing process, resulting in exceptional dimensional accuracy and a superior surface finish. Designed to withstand high pressure and stress, they exhibit excellent tensile strength and fatigue resistance, making them ideal for hydraulic applications. The seamless construction eliminates weld weaknesses, enhancing reliability and safety. With outstanding corrosion resistance, these tubes ensure longevity in challenging environments. Their precision specifications cater to various industries, including automotive and manufacturing, where performance and durability are crucial for hydraulic systems.
| Standard | DIN2391, EN10305, ASTM A519, GB/T 3639-200 |
| Material | Q355B Q355D C20, ST52, E355 SAE1026, CK45 4130 4140 STKM 13C |
| Heat Treatment | BK+S |
| Outer Diameter | 40-480mm |
| Inner Diameter | 30-400mm |
| I.D Tolerance | H8-H9 |
| Length | Fixed Length, Random Length (3-9m) or as per customer requirements |
| Straightness | 0.5-1/1000 |
| ID Roughness | RA 0.1-0.8 micron (max) |
| Technology | Honed & SRB (Skived and Roller Burnished) |
| Scope | Honed tube for hydraulic cylinder, swivel crane, injection machine, and construction machine applications |
Straightness of the tubes is influenced by the mechanical properties of the tubes. For material having the yield point ReH ≤ 500 MPa, straightness is 0.0015 multiple of the tube length maximum, allowed straightness for one meter length is 1.5 millimeters. For material with the yield point ReH > 500 MPa, the allowable straightness for the whole length of the tube is 0.0020 multiple of the tube length, allowed straightness of one meter is 2 millimeters.
| Steel Grade | +C | +LC | +SR | +A | +N |
|---|---|---|---|---|---|
| E155 | Rm 400 MPa, A 6% | Rm 350 MPa, A 10% | Rm 350 MPa, ReH 245 MPa, A 18% | Rm 260 MPa, A 28% | Rm 270-410 MPa, ReH 155 MPa, A 28% |
| E195 | Rm 420 MPa, A 6% | Rm 370 MPa, A 10% | Rm 370 MPa, ReH 260 MPa, A 18% | Rm 290 MPa, A 28% | Rm 300-440 MPa, ReH 195 MPa, A 28% |
| E235 | Rm 490 MPa, A 6% | Rm 440 MPa, A 10% | Rm 440 MPa, ReH 325 MPa, A 14% | Rm 315 MPa, A 25% | Rm 340-480 MPa, ReH 235 MPa, A 25% |
| E275 | Rm 560 MPa, A 5% | Rm 510 MPa, A 8% | Rm 510 MPa, ReH 375 MPa, A 12% | Rm 390 MPa, A 21% | Rm 510-550 MPa, ReH 275 MPa, A 21% |
| E355 | Rm 640 MPa, A 4% | Rm 590 MPa, A 6% | Rm 590 MPa, ReH 435 MPa, A 10% | Rm 450 MPa, A 22% | Rm 490-630 MPa, ReH 355 MPa, A 22% |
| Steel Grade | C max | Si max | Mn max | P max | S max |
|---|---|---|---|---|---|
| E155 | 0.11 | 0.35 | 0.70 | 0.025 | 0.025 |
| E195 | 0.15 | 0.35 | 0.70 | 0.025 | 0.025 |
| E235 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 |
| E275 | 0.21 | 0.35 | 1.40 | 0.025 | 0.025 |
| E355 | 0.22 | 0.35 | 1.60 | 0.025 | 0.025 |
| Designation | Symbol | Description |
|---|---|---|
| Cold finished (hard) | BK | Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation. |
| Cold finished (soft) | BKW | The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding). |
| Cold finished and stress-relieved | BKS | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
| Annealed | GBK | The last cold forming process is followed by annealing in a controlled atmosphere. |
| Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Company Details
Business Type:
Manufacturer
Year Established:
1958
Total Annual:
>76000000
Employee Number:
700~1000
Ecer Certification：
Verified Supplier
Jiangsu Hongbao Group (Pipe) Co., Ltd. (Zhangjiagang Hongda Pipe Co., Ltd.) is a high-tech company in Jiangsu province. The company has a registered capital of RMB 89 million, covers an area of 130,000 square meters, employs 600 staff, and has annual sales of RMB 400 million. The company is speciali... Jiangsu Hongbao Group (Pipe) Co., Ltd. (Zhangjiagang Hongda Pipe Co., Ltd.) is a high-tech company in Jiangsu province. The company has a registered capital of RMB 89 million, covers an area of 130,000 square meters, employs 600 staff, and has annual sales of RMB 400 million. The company is speciali...
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