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4140 Hard Chrome Bar
As a leading manufacturer and supplier, EASTAI has proudly specialized in the production and distribution of 4140 hard chrome plated bars for over 15 years. With a steadfast commitment to quality and customer satisfaction, our team is dedicated to meeting the diverse needs of our clients. For any inquiries or to discuss your specific requirements, please feel free to contact us at jeff@east-ai.cn . Our responsive team guarantees to provide you with a comprehensive solution within one working day.
Material: 4140, 42CrMo, 42Crmo4, SCM440, SAE4130 (25CrMo4), SAE4340 (36CrNiMo4)
Diameter: Φ 6-500mm
Length: Max 20 meters
Chrome Layer: Minimum 20/25/30/50 Micron or customized
Hardness of the Chrome Layer: 850 HV (minimum) – 1150 HV
Roughness: Ra <= 0.4
Straightness: <= 0.5/1000
Diameter Tolerance: ISO f7/f8/f9/h8/h9 or as requested
Roundness: Half of the tolerance of ISO f7
Heat Treatment Types:
- Normal (no heat treatment)
- Q+T (Quenched + Tempered)
- Induction Hardened
Chrome plated bar/ Hard chrome rod/Induction hardened chrome bar
| C% | Si % | Mn % | P% | S% | Cr % | Mo % | |
| Min | 0.36 | 0.10 | 0.65 | 0.75 | 0.15 | ||
| Max | 0.44 | 0.40 | 1.10 | 0.04 | 0.04 | 1.20 | 0.35 |
| Yield stress Rp0.2,N/nn2, min | UItimate tensile Stress Rm,N/nn2 | Elongation A5,%,min | Hardness HB |
| 800 | 900 | 20 | 270 |
| Grade of tolerance Dia mm φ | f | 9 | h | |||
| f7 | f8 | 06 | h7 | h8 | h9 | |
| 3mm | -0.006 -0.016 | -0.006 -0.020 | 0.002 0.008 | 0 -0.010 | 0 -0.014 | 0 -0.025 |
| 3mm-6mm | -0.010 -0.022 | -0.010 -0.028 | -0.004 -0.012 | 0 0.012 | 0 -0.018 | 0 -0.030 |
| 6mm-10mm | -0.013 -0.028 | -0.013 -0.035 | -0.005 -0.014 | 0 -0.015 | 0 -0.022 | 0 -0.036 |
| 10mm-18mm | -0.016 -0.034 | -0.016 -0.043 | -0.006 0.017 | 0 -0.018 | 0 -0.027 | 0 -0.043 |
| 18mm-30mm | -0.020 -0.041 | -0.020 -0.053 | -0.007 -0.020 | 0 -0.021 | 0 -0.033 | 0 -0.052 |
| 30mm-50mm | -0.025 -0.050 | -0.025 -0.064 | 0.009 -0.025 | 0 0.025 | 0 -0.039 | 0 0.062 |
| 50mm-80mm | -0.030 -0.060 | 0.030 -0.079 | -0.010 -0.029 | 0 -0.030 | 0 -0.046 | 0 -0.074 |
| 80mm-120mm | -0.036 -0.071 | -0.036 -0.090 | -0.012 0.034 | 0 -0.035 | 0 -0.054 | 0 -0.087 |
| 120mm-180mm | -0.043 -0.083 | -0.043 -0.106 | 0.014 -0.039 | 0 -0.040 | 0 -0.063 | 0 -0.100 |
| 180mm-250mm | -0.050 -0.096 | -0.050 -0.122 | 0.015 0.044 | 0 -0.046 | 0 -0.072 | 0 -0.115 |
| 250mm-315mm | -0.056 -0.108 | -0.056 0.137 | -0.017 0.049 | 0 -0.052 | 0 -0.081 | 0 -0.130 |
| 315mm-400mm | -0.062 -0.119 | -0.062 -0.151 | 0.018 -0.054 | 0 -0.057 | 0 -0.089 | 0 -0.140 |
| 400mm-500mm | -0.068 -0.131 | -0.068 -0.165 | -0.020 -0.060 | 0 -0.063 | 0 -0.097 | 0 -0.155 |
Delivery condition
Hard Chrome Piston Rod
Quenched & Tempered (Q+T) Rod
Induction Hardened Rod
Q+T Induction Hardened Rod
Corrosion resistance:
Test in natural salt spray according to ASTM B 117-96 hours.
Advantages Of Our 4140 Hard Chrome Bars
- We meticulously manufacture precision material parts in strict adherence to customer-provided drawings, packaging specifications, and quality requirements.
- We achieve tolerances as tight as +/-0.01mm, ensuring high precision in every component.
- Our quality assurance is backed by the industry’s most advanced inspection tools to guarantee unparalleled quality.
- Our team comprises highly experienced engineers and skilled workers, dedicated to excellence in every project.
- We pride ourselves on fast and timely delivery, ensuring that every order is fulfilled promptly and professionally.
- We offer expert guidance during the design process, providing valuable suggestions to optimize costs without compromising quality.
Our main business range is listed as follows
Carbon Seamless Steel pipe/tube
Hydraulic cylinder tube(Honed tube)
Hard chrome plated rod/bar/shaft(Piston rod)