Production Description
1) Precision pipe Images, Usage and Standard
Usage: Hydraulic Pipe, Fluid Pipe, physical construction, hydraulic device, automobile parts, Steel sleeve, bearing, hydraulic cylinder, Pneumatic cylinder and hydraulic pipe
Standard: ISO, JIS, GB, DIN, ASTM, API
2) Drawing of Precision Pipe
3) Product Size Specification Table (mm) (Blue Area)
Remark: We also produce customized sizes out of this list
4) Chemical composition
Chemical composition of precision pipe in frequently used grade
| Standard | Grade | Chemical composition (%) |
| | | C | Si | Mn | S | P | Cr |
| GB/T699 | 10# | 0.07~0.13 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | |
| GB/T3639-2000 | 20# | 0.17~0.23 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | |
| GB3077-88 | 35# | 0.32~0.39 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | |
| | 45# | 0.42~0.50 | 0.17~0.37 | 0.50~0.80 | ≤0.035 | ≤0.035 | |
| | 40cr | 0.37~0.44 | 0.17~0.37 | 0.50~0.80 | ≤0.035 | ≤0.035 | 0.08~1.10 |
| | 25Mn | 0.22~0.29 | 0.17~0.37 | 0.70~1.00 | ≤0.035 | ≤0.035 | ≤0.25 |
| | 37Mn5 | 0.30~0.39 | 0.15~0.30 | 1.20~1.50 | ≤0.015 | ≤0.020 | |
5) Mechanical properties
Mechanical properties of common precision pipe
| Standard | Grade | Designation (%) |
| | | Cold finished (hard)(BK) | Cold finished (Soft) BKW |
| | | UTS(Ultimate Tensile Strength) | percentage elongation after fracture | UTS(Ultimate Tensile Strength) | percentage elongation after fracture |
| | |
| | | σ b (Mpa) | δ 5(%) | σ b (Mpa) | δ 5(%) |
| GB/T3639-2000 | 10# | ≥410 | ≥6 | ≥375 | ≥10 |
| GB3077-88 | 20# | ≥510 | ≥5 | ≥450 | ≥8 |
| | 35# | ≥590 | ≥4 | ≥550 | ≥6 |
| | 45# | ≥645 | ≥4 | ≥630 | ≥5 |
| | 40cr | ≥784 | ≥12 | | |
| | 37Mn5 | ≥784 | ≥12 | | |
Remarks:
Cold Finished (Hard): Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation
Cold Finished (Soft): 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)
6) Product Application Industry
Application Field:
Mechanical processing, machinery manufacturing, automobile
7) Quality Control
A. Advanced Production Equipment
B. Skill-full and Qualfied Workers, Training and Testing before Working
C. Strictly Qualtity Control System
8) Packing & Shipping
A) Packing Method
Small size in bundles, big size in bulk, with plastic cap to protect both ends, seaworthy packaging or as per customer's requests.
B) Shipping Way
As per customer's request.
Usually by Sea, by Air, by Train or River-and-Sea Coordinated Transport.
