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

Send The Sample For Your Testing

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

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

Main hydraulic cylinder parts:

Precision cold drawn steel, honing steel, precision piston rod, hydraulic cylinders and various hydraulic system design and manufacturing. The company has a professional production plant, for many years engaged in hydraulic engineering research and design experts and have rich practical experience in engineering and technical personnel, a dedicated production equipment, advanced production technology, and improve the quality assurance system to ensure product quality , With the best after-sales service for customers value.

Shenzhen Dallast Technology Co ., Ltd. it is hydraulic cylinder manufacturing enterprise integrated with professional designing, production and sales . Company focused, specialized in various types of hydraulic cylinder.Is widely used in dump trucks , dump trailers, garbage trucks, excavators, loaders , forklifts, cranes and other projects , ships, mining machinery and fire engines , sanitation vehicles and other special vehicles, agricultural machinery , heavy machinery and many other fields .