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编辑同志: 机械制造6卷3期杨增远著‘对铜合金鑄件多孔性的防止和補救方法’文中说:‘含锡量超过10％的青铜不能做退火处理。’但机械工业出版社出版的1954年第3期‘鑄工’杨景祥译自卡其莫夫著‘消滅有色金属鑄件的多孔性’:含锡14％的青铜,在鑄态下的抗拉强度为25～30公斤/平方公厘,延伸率为l～5％;在650℃经4小时焖火,然後於爐中冷却,其抗拉强度为30～35公斤/平方公厘,延伸率为10～20％。我厂浇鑄含锡量13％青铜都照‘鑄工’第三期的经验经验,经过600～650℃
Comrade: Machinery Manufacturing 6 Volume 3 Yang Zengyuan ’on the copper alloy casting porosity prevention and remedies’ article said:’ Bronze containing more than 10% tin can not be annealed. However, published by Machinery Industry Press, 1954 No. 3 Castor Yang Jingxiang translated by Khamimov with ’eliminate the porosity of non-ferrous metal castings’: tin 14% of the bronze, the as-cast tensile strength of 25 The tensile strength is 30-35 kg / mm ^ 2, the elongation is 10 ~ 30 kg / mm ^ 2, the elongation is 1-5%, the stew fire at 650 ° C for 4 hours and then cooled in the furnace, 20%. Our factory cast bronze with 13% of tin content is according to the experience of the third phase of “Castor”, after 600 ~ 650 ℃