SAE 4140 steel pipe with medium strength, has high resistance to fatigue. Better hardenability in larger cross sections, resistance to fatigue and fracture. Applicable to the construction industry Supporting structure, Stent, Rod, Gas and liquid transfer equipment and so on.
SAE 4140 Heat treatment:
Annealing: The treatment should be done at the temperature of 850 ° C for at least 1 hour for every 25 mm. Cool slowly in the oven.
Annealing: The treatment should be done at the temperature of 850 ° C for at least 1 hour for every 25 mm. Cool slowly in the oven.
Standardization: The treatment should be done at the temperature of 870 – 900 ° C for at least 1 hour for every 25 mm. Cool air. In special cases can use forced air.
Temper: austenize in temperature between 840 – 870ºC. Heat for 1 hour for each 25 mm thick and add 1 additional hour for each 25 mm. Cool in oil or polymer. Cooling polymer leads to smaller dimensional change and improved microstructural homogeneity.
Tempering: It must be done immediately after hardening when the temperature reaches ~ 70 ° C. The tempering temperature must be selected according to the hardness specified in the component. For this use the tempering curve. Keeping the tempering temperature for at least 1 hour for each 25 mm thick and used for at least two hours. No tempering between 230-370ºC because of weakness to tempering.
Temper: austenize in temperature between 840 – 870ºC. Heat for 1 hour for each 25 mm thick and add 1 additional hour for each 25 mm. Cool in oil or polymer. Cooling polymer leads to smaller dimensional change and improved microstructural homogeneity.
Tempering: It must be done immediately after hardening when the temperature reaches ~ 70 ° C. The tempering temperature must be selected according to the hardness specified in the component. For this use the tempering curve. Keeping the tempering temperature for at least 1 hour for each 25 mm thick and used for at least two hours. No tempering between 230-370ºC because of weakness to tempering.
Nitriding: The steel can be nitrided to increase the wear resistance of the surface hardening. The maximum hardness depends on the precondition of heat treatment. benefit components before nitriding have better hardening characteristic reaching next maximum hardness of 800 HV. It is recommended hardening depth of between 0.30 and 0.60 mm.
Surface Hardening: Can be performed by flame or induction process to hardness greater than 55 HRC.
Surface Hardening: Can be performed by flame or induction process to hardness greater than 55 HRC.
Shanghai Katalor Enterprises Co., Ltd. can provide customers with high quality SAE 4140 steel pipe, our SAE 4140 steel pipe has a large number of spot inventory, and we also can a variety of steel processing equipment to meet the different needs of customers, if you are interested in purchasing SAE 4140 steel pipe, please contact Katalor.
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