GB/T 3094 Seamless Steel Pipe For Industrial Machinery
Material and Specification
The GB/T 3094 standard specifies the requirements for seamless steel pipes used in industrial machinery. These pipes are made from various materials and come in different specifications to suit specific industrial applications.
| Material | Specification |
| Carbon Steel | 10, 20, 35, 45, Q345 |
| Alloy Steel | 12CrMo, 15CrMo, 20CrMo |
| Stainless Steel | 0Cr18Ni9, 1Cr18Ni9Ti |
Chemical Composition
The chemical composition of the materials used in GB/T 3094 seamless steel pipes for industrial machinery is critical to ensuring the pipes' performance and durability. The following table outlines the typical chemical composition of each material:
Carbon Steel
| Material Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
| 10 | 0.07-0.13 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 |
| 20 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 |
| 35 | 0.32-0.39 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 |
| 45 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 |
| Q345 | 0.12-0.20 | 0.20-0.55 | 1.20-1.60 | ≤0.035 | ≤0.035 |
Alloy Steel
| Material Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Mo (%) |
| 12CrMo | 0.08-0.15 | 0.17-0.37 | 0.40-0.70 | ≤0.030 | ≤0.030 | 0.90-1.20 | 0.15-0.30 |
| 15CrMo | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | ≤0.030 | ≤0.030 | 0.80-1.10 | 0.40-0.55 |
| 20CrMo | 0.17-0.24 | 0.17-0.37 | 0.40-0.70 | ≤0.030 | ≤0.030 | 0.80-1.10 | 0.15-0.25 |
Stainless Steel
| Material Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Ti (%) |
| 0Cr18Ni9 | ≤0.07 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.030 | 17.00-19.00 | 8.00-11.00 | - |
| 1Cr18Ni9Ti | ≤0.12 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.030 | 17.00-19.00 | 8.00-11.00 | 5xC-0.70 |
Mechanical Properties
The mechanical properties of the GB/T 3094 seamless steel pipes are vital in determining their load-bearing capacity and overall performance in industrial machinery applications. The tables below present the typical mechanical properties of each material.
Carbon Steel
| Material Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Energy (J) |
| 10 | ≥335 | ≥205 | ≥24 | ≥27 |
| 20 | ≥410 | ≥245 | ≥20 | ≥27 |
| 35 | ≥490 | ≥295 | ≥17 | ≥27 |
| 45 | ≥590 | ≥335 | ≥14 | ≥27 |
| Q345 | ≥490 | ≥325 | ≥21 | ≥34 |
Alloy Steel
| Material Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Energy (J) |
| 12CrMo | 410-550 | ≥205 | ≥21 | ≥39 |
| 15CrMo | 440-640 | ≥235 | ≥21 | ≥39 |
| 20CrMo | 410-570 | ≥245 | ≥21 | ≥39 |
Stainless Steel
| Material Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| 0Cr18Ni9 | 520-720 | ≥205 | ≥40 | ≤187 |
| 1Cr18Ni9Ti | 520-720 | ≥205 | ≥40 | ≤187 |
Steel Grade and Application
The GB/T 3094 seamless steel pipes are classified into various steel grades, each with specific applications in industrial machinery. Below are some common steel grades and their corresponding applications:
| Steel Grade | Application |
| 10 | General machinery, mechanical parts |
| 20 | Steam boiler tubes, high-pressure piping |
| 35 | Gears, shafts, axles |
| 45 | Crankshafts, connecting rods |
| Q345 | Structural purposes, bridges, buildings |
| 12CrMo | High-temperature resistant equipment |
| 15CrMo | Power plant equipment, pipelines |
| 20CrMo | Steam turbines, boilers |
| 0Cr18Ni9 | Chemical equipment, food processing |
| 1Cr18Ni9Ti | Corrosion-resistant equipment |
These steel pipes are crucial components in various industrial machinery applications due to their exceptional mechanical properties, chemical composition, and suitability for different working environments. The GB/T 3094 standard ensures the quality and reliability of seamless steel pipes, contributing to the efficiency and safety of industrial machinery operations.
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