怎么查球墨铸铁的化学成分?

题目

怎么查球墨铸铁的化学成分?

答案

农机零件实例::球墨铸铁的化学成分:C 3.6-3.8,SI 2.3-2.7,Mn <0.5 ,P<0.08,S<0.025 ,Mg 0.03-0.05,RE 0.02-0.03 基体组织 退火铸铁.
一般要根据机械性能要对化学成分进行匹配,没有固定的成分.
Microstructure:Matrix:Ferrite and max.10 % pearlite.母体:铁素体和最大10 %的珠光体
微观组织 Graphite:Minimum 90 % form V and VI.according to EN/ISO 945:
石墨:最小90 % 形式V 和VI级别 根据EN/ISO 945
Maximum graphite sizes according to reference number 4.石墨最大尺寸根据参考4
Form I and II are unacceptable.I 和 II级不接受
The microstructure must be documented with photos and certified.要提供微观结构的照片和证明
Homogenity:(同一性) The items must be free from shrinkages,sand/slag and gas porosities.Absolutely no cracks must be found neither external nor internal on the object (this includes hot tears).Linear- and non-linear indications most fulfil the demand stated in CI 3753.
铸体必须无缩孔,沙眼/渣眼和气孔.无论铸体的内部还是外部都绝不允许有裂纹.
线性和非线性要按CI 3753规定的执行.
Surface condition:Repair welding is not allowed in any case.
表面形式:不得有任何形式的焊接
Surface discontinuities must meet the acceptance criteria specified in the CUSTOMER control instructions.表面的不连续性要符合用户控制说明的接受标准