【原】EN13445设计：封头热处理

最近设计2台按照EN13445规范设计的罐子，设备需要CE认证。一台设备主体材料是SA-516 Gr.70，按照PED要求对材料做PMA，材料使用方面没有什么问题。但对于碳钢封头需不需要做母材热处理试板比较有争议。根据EN13445中9.2变形率公式计算，封头变形率23%，远大于5%。封头采用冷成型压制，成型后热处理。按照大家固有思维（不管国标还是ASME），封头只是消除应力热处理，所以不需要制作母材热处理试板，先看下EN13445-4对成型后热处理的定义。

    热处理：正火、正火+回火、淬火+回火、退火、固溶退火

   9.4.1 Heat treatments after cold or hot forming, shall be carried out in accordance with the appropriate standards or data sheets or other specifications and shall include normalising, normalising plus tempering, quenching plus tempering,annealing, solution annealing.

    规定变形率大于5%，冷成型后需进行热处理。

   9.4.2 Postforming heat treatments of flat products after cold forming of flat products shall becarried out in accordance with 9.4.1 and Table 9.4-1.

     冷成型或热成型后热处理需增加母材试板

  9.5.2 Hot formed or cold formed products with heat treatment compliance with the material specifications shall be verified by means of test coupons taken from excess of length of the formed product. Where this is not possible separate test coupons shall be taken from the original material, formed and heat treated if appropriate in the same way as the formed product and tested.

    试板需要制作1个纵向拉伸试样和3个冲击试样

    9.6.1  Base material

   One tensile test and three impact test specimens shall be taken from each test coupon required in 9.5.2. The test specimens shall be taken transverse to the rolling direction with a deviation not greater than 20°.

    9.6.2   Butt welds

  Where formed products are welded together from several individual parts before forming, the production test shall be performed in accordance with the frequency described in 8.4

    另一台设备主体材料是SB-162 N02201，根据EN13445 9.2变形率公式计算，封头变形率23%，远大于10%。封头采用冷成型压制，根据EN13445-10中7.10.1成型后进行退火处理。

   冷成型或热成型后热处理需增加母材试板

   7.11.2 Hot formed or cold formed products with heat treatment

   试板需要制作1个纵向拉伸试样

   7.12.1 Base material

   One tensile test specimen shall be taken from each test coupon required by 7.11.2. Test specimens shall be taken transverse to the rolling direction wherever possible.

   7.12.2 Butt welds

  Where multiple parts are formed after being welded together, one all weld metal tensile test specimen shall be taken from the weld metal, for each welding procedure specification (WPS), each cast off iller metal used and for each formed product.

      GB、ASME、EN13445、API

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