42CrMo4 Hollow Piston Rods Bar NSS 240 350 550 Hours For Telescopic Hydraulic Cylinder
40Cr 40Crmo4 42CrMo Piston Hollow Rods Hard Chrome Plated Steel Bar For Hydraulic Ram NSS 1000 Hours
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| specification | φ3-φ12 | φ16-φ25 | φ30-φ50 | φ55-φ100 | φ105-φ120 | |
| Length | 200-2000 | 200-3000 | 200-5000 | 200-10000 | 1000-10000 | |
| Scheduling axis hardness | HB220-280 | |||||
| Surface hardness | >860 HV0.1 | The straightness | 0.15/1000mm | |||
| Accuracy | g6 grade h7 grade | Hardened layer depth | 0.8-3mm | |||
| Roundness tolerance |
<=0.01 |
APT thickness | 10um-40um | |||
| Full length tolerance |
<=0.02 |
The materiel | 42CrMo4 | |||
| Surface roughness | Ra 0.2- 0.4 |
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Heat treatment
2. After quenching, put into the oil tank to cool from the box furnace
3. After cooling, the first time tempering: tempered at 640 °C and the hardness is controlled at about HRC28-32, the first time tempering cooling is used Water-cooled.
4. Straightening: The outer circle is controlled by 200 um(0.2mm) ;
straightening equipment:
three-roller straightening machine；
hydraulic straightening machine (multipoint straightening)
5. The second tempering removes the hard force, the temperature is about 480 °C, and Keep warm for 2 -2.5hours ; release 80% more or less
| CHEMICAL COMPOSITION | |||||||||||||||||||||||||||||||||||||||||||||||||
| Material | C% | Mn% | Si% | S% | P% | V% | Cr% | ||||||||||||||||||||||||||||||||||||||||||
| Ck45 | 0.42-0.50 | 0.50-0.80 | 0.04 | 0.035 | 0.035 | ||||||||||||||||||||||||||||||||||||||||||||
| ST52 | 0.22 | 1.6 | 0.55 | 0.035 | 0.04 | ||||||||||||||||||||||||||||||||||||||||||||
| 20MnV6 | 0.16-0.22 | 1.30-1.70 | 0.10-0.50 | 0.035 | 0.035 | 0.10-0.20 | |||||||||||||||||||||||||||||||||||||||||||
| 42CrMo4 | 0.38-0.45 | 0.60-0.90 | 0.15-0.40 | 0.03 | 0.03 | 0.90-1.20 | |||||||||||||||||||||||||||||||||||||||||||
| 40Cr | 0.37-0.45 | 0.50-0.80 | 0.17-0.37 | 0.80-1.10 | |||||||||||||||||||||||||||||||||||||||||||||
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MECHANCIAL PROPERTIES |
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NSSTesting Standing ISO9227:2017
· Sal solution: 50 (+/- 5) g/l of NaCl. Water is demineralized and salt purity is 99.5%.
· Environmental temperature: 35 °C.
· pH of salt solution is 6.8.
· Volumen of salt solution is 38.4 ml/day.
· Density of salt solution is 1,030 g/cm3.
· Spraying is 1.5 (+/- 0.5) ml/h.
Test Result :NSS can endure 300 hours ;500 hours; 800 hours
SGS NSS Testing Report TUV NSSTesting Repopt
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