AISI 4140/42CrMo4 SRB Tube
AISI 4140/42CrMo4 SRB Tube
AISI 4140/42CrMo4 SRB Tube is a premium-grade, precision-engineered hydraulic tube that combines superior material strength with advanced manufacturing technology to deliver exceptional performance in high-pressure applications.
AISI 4140 / 42CrMo4 SRB Tube offers an optimal balance of strength, precision, and surface quality, making them a top choice for hydraulic systems, industrial machinery, and high-performance engineering applications.
Advantages
1. Superior Surface Finish & Precision: Mirror-like internal surface (Ra ≤ 0.4 μm) reduces friction and wear, extending seal life;Tighter tolerances (H8/H9) than DOM or honed tubes for better piston fit.
2. Material Performance Benefits: Chromium-molybdenum alloy provides superior toughness and impact resistance;Heat-treatable for customized hardness.
3. Enhanced Durability & Strength: AISI 4140/42CrMo4 SRB Tube work-hardened inner surface from roller burnishing increases wear resistance;High tensile strength for heavy-load applications;Excellent fatigue resistance for dynamic, high-pressure cycles
4. Corrosion Resistance: The steel composition provides moderate resistance to corrosion, especially when properly maintained.
5. Seamless Construction: The seamless nature of the tube ensures uniformity and reliability in high-pressure applications.
6. Versatility: Suitable for a wide range of applications, including hydraulic cylinders, pneumatic cylinders, and precision engineering components.
Material Composition
| Element | AISI 4140 (ASTM) | 42CrMo4 (DIN/EN) |
|---|---|---|
| Carbon (C) | 0.38–0.43% | 0.38–0.45% |
| Chromium (Cr) | 0.80–1.10% | 0.90–1.20% |
| Molybdenum (Mo) | 0.15–0.25% | 0.15–0.30% |
| Manganese (Mn) | 0.75–1.00% | 0.60–0.90% |
| Silicon (Si) | 0.15–0.35% | 0.15–0.40% |
| Phosphorus (P) (max) | ≤0.035% | ≤0.025% |
| Sulfur (S) (max) | ≤0.040% | ≤0.035% |
| Iron (Fe) | Balance | Balance |
Mechanical Properties
| Property | Metric Units | Imperial Units |
|---|---|---|
| Tensile Strength | 850-1000 MPa | 123,000-145,000 psi |
| Yield Strength | 650-780 MPa | 94,000-113,000 psi |
| Elongation at Break | 12-18% | 12-18% |
Delivery Conditions
| 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 conditionsthe 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. |
Delivery Condition: SR,BK, BK+S, GBK, NBK
ID Size : 20mm – 1500mm
Length: max 16m
Type: Seamless, Hot Rolled, Cold Rolled, Cold Drawn
Straightness: ≤ 0.5/1000
Tolerance: H8,H9,as request
Protection: Anti-rust oil on inside and outside surface, plastic caps in both ends.
Packing: Bundle with steel strip and PE sheet or Plywood case
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