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18CrNiMo7-6 / 1.6587 Steel Round Bars
18crnimo7-6 corresponds to the domestic brand 17Cr2Ni2Mo.
18CRNIMO7-6 is a European standard alloy structural steel material. 17CrNiMo6 is the steel number of the German DIN17210-(86) standard, the European standard is 18CrNiMo7-6, corresponding to GB 17Cr2Ni2Mo
18CrNiMo7-6 Heat treatment data:
Forging: heated to 1150°C, maintained until uniform microstructure Minimum forging temperature 850°C Annealing: heating temperature: 830°C-850°C, furnace cooling and normalizing: ………… : 860°C-890°C, air cooling stress relief annealing:...... : 630°C-650°C, air-cooled carburizing:...... : 900°C-950°C Core Thinning:...... : 830°C-870°C, air cooling, oil quenching or quenching into 150°C-200°C salt bath furnace after air cooling surface strengthening:...... : 780°C-820°C,
oil quenching:
From carburizing temperature to 820°C - 830°C air cooling or oil quenching or quenching into the salt bath furnace
Or choose to cool to room temperature after heating to 820°C - 830°C after air cooling or oil quenching or quenching into the salt bath furnace tempering: tempering at 150°C - 200°C temperature can improve the toughness of the small reduce hardness, reduce the possibility of grinding cracks. The above heat treatment data is for reference only.
Corresponding to the domestic 17Cr2Ni2Mo brand,
17CrNiMo6 is the steel number of the German DIN 17210- (86) standard, the European standard is 18CrNiMo7-6, corresponding to GB 17Cr2Ni2Mo 17Cr2Ni2Mo is GB material. The specific standard number is: JB/T 6395-2010 large gear, gear ring forging 17CrNiMo6 and 20CrMnTi Difference: 17CrNiMo6 toughness is much better carbon content is different, alloying elements are different, mechanical properties are different. The thermal process is also different. The performance of the front is superior, and the latter transmission gear and differential gear are commonly used.
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