45# Seamless Steel Pipes
We are a source manufacturer of 45# seamless steel pipes, maintaining a full range of hot-rolled and cold-drawn specifications in stock. Our materials are authentic and traceable. Our leading factory in China provides one-stop deep processing including heat treatment, internal honing, and length cutting. We maintain strict quality control and offer fast production scheduling for non-standard customization, fully meeting the material needs of various scenarios such as machining and heavy-duty structures.
45# seamless steel pipes are divided into two main categories according to their production process: hot-rolled structural pipes and cold-drawn/precision pipes. The domestic market mainly offers hot-rolled structural pipes and cold-drawn precision pipes for machining. The following are the mainstream specifications commonly available in the market, all conforming to the corresponding national standards.
Mainstream specifications of hot-rolled 45# seamless steel pipes
(complies with GB/T 8162 structural standard)
|
Commonly Used Outer Diameters (mm) |
Standard wall thickness specifications (mm): |
Standard lengths: |
Core Application Scenarios |
|
57, 60, 63.5 |
3.5, 4, 5, 6, 8, 10, 12, 14 |
6 meters / 12 meters |
Small-diameter mechanical sleeves, pins, fastener blanks |
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76, 89, 102, 108 |
4, 5, 6, 8, 10, 12, 14, 16, 20, 25 |
6 meters / 12 meters |
General-purpose mechanical bushings, hydraulic cylinder blanks, conventional load-bearing structural components |
|
114, 133, 140, 159, 168 |
4.5, 5, 6, 8, 10, 12, 14, 16, 20, 25, 30 |
6 meters / 12 meters |
Heavy-duty structural components, mining equipment pipe fittings, medium-sized hydraulic cylinder bodies |
|
180, 219, 245, 273 |
6, 8, 10, 12, 14, 16, 20, 25, 30, 35, 40 |
6 meters / 12 meters |
Large-scale mechanical load-bearing components, thick-walled bushings, pile foundation components |
|
325, 351, 377, 426 |
8, 10, 12, 14, 16, 20, 25, 30, 40, 50 |
6 meters standard length is the primary standard length |
Heavy-duty equipment cylinders, large-diameter thick-walled structural components, flange blanks |
|
480, 530, 630 |
10, 12, 14, 16, 20, 25, 30, 40, 50, 60 |
6 meters standard length is the primary standard length |
Extra-large structural components, heavy-duty machinery cylinders, forged base materials |
Mainstream specifications of cold-drawn/precision 45# seamless steel pipes
(complies with GB/T 3639 precision standard)
|
Outer diameter interval (mm) |
Standard wall thickness specifications (mm) |
Dimensional accuracy grades |
Standard delivery lengths |
Core Application Scenarios |
|
φ6~φ20 |
1, 1.5, 2, 2.5, 3, 4 |
H8~H10 |
3~6 meters (fixed length) |
Precision bushings, miniature pins, fasteners, instrument parts |
|
φ22~φ76 |
1.5, 2, 2.5, 3, 4, 5, 6, 8 |
H8~H10 |
4~6 meters (fixed length) |
Machine-machined bushings, precision hydraulic components, gear bodies, tempered parts |
|
φ80~φ127 |
2, 3, 4, 5, 6, 8, 10, 12 |
H9~H11 |
4~6 meters (fixed length) |
Medium-thick wall precision structural parts, cylinder blanks, transmission bushings |
|
φ133~φ219 |
3, 4, 5, 6, 8, 10, 12, 16, 20 |
H9~H11 |
6 meters (fixed length) |
Large-diameter precision load-bearing components, heavy-duty hydraulic cylinder blanks |
What are the differences between 45# seamless steel pipes and 20# and 40Cr seamless steel pipes, and how should you choose?
The core differences lie in strength and positioning. 20# is low-carbon steel with good plasticity and weldability, suitable for fluid transportation and cold bending welding applications; 45# is medium-carbon steel, which can be tempered and strengthened, resulting in higher strength, primarily used for machining heavy-duty and wear-resistant parts; 40Cr is alloy structural steel with better hardenability and fatigue resistance than 45#, suitable for heavy-duty high-end transmission components. For ordinary medium-to-high strength machining, 45# offers the best cost-performance ratio, while 40Cr is chosen for heavy-duty, high-requirement applications.
Can 45# seamless steel pipe be tempered? What hardness can be achieved after tempering?
45# is the most commonly used tempering base material and fully supports tempering. After conventional tempering, the hardness is stable at HB220~280, and the tensile strength can reach over 600MPa, with a balanced match of strength, toughness, and plasticity; the process can also be adjusted according to requirements to control within the target hardness range.
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