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35B钢成分与35钢相近,但35钢作为冷拨材未要求力学性能,只要求作硬度检查。而35B则要求光亮退火后的力学性能(表1)。生产中冷拔35B钢常发生抗张强度不稳和硬度不够均匀。为了改善35B的性能,重新制订了工艺方案,取得了良好效果。一、试验条件试验坯料为45毫米冷拔到44.5毫米,在罩式炉内进行热处理。热处理工艺为670℃2小时,炉冷2小时出炉。按7％、11％、13％和19％的减面率进行冷拔。测试冷拔态机械性能。再分别按380℃、520℃、600℃和65℃,保温4小时进行光亮退火。其成
35B steel composition and 35 similar steel, but 35 steel as cold dial material does not require mechanical properties, as long as the required hardness test. While 35B requires mechanical properties after bright annealing (Table 1). 35B cold-drawn steel production often occurs in the tensile strength and hardness is not enough uniform. In order to improve the performance of 35B, a new process plan has been made and good results have been achieved. First, the test conditions The test blank is 45 mm cold drawn to 44.5 mm, heat treatment in a hood furnace. Heat treatment process is 670 ℃ 2 hours, furnace cooling 2 hours baked. Cold drawn at 7%, 11%, 13% and 19% reduction rates. Test cold drawn state mechanical properties. Then by 380 ℃, 520 ℃, 600 ℃ and 65 ℃, heat 4 hours bright annealing. Its into