Transactions of Materials and Heat Treatment

Title：Effect of forging process on crack of shell flange-rear head end

Authors： CHEN Sun-yi (Sinopec Maoming Petrochemical Machinery Plant Maoming 525024 China)

Unit：

KeyWords： crack flange forging

ClassificationCode：TG316

year,vol(issue):pagenumber：2008,33(2):6-9

Abstract：

The reasons why the shell flange-rear head end cracked during hydraulic test for a heat exchanger on a lower pressure were analyzed.After full checks and tests for the appearance of flange,surface hardness,chemical composition of material,mechanical properties,metallurgical phase,stress level and forging process,it was found that the hardness of turn angle on large end of flange neck was super high.And the metallurgical phase was not normalized structure because the crystal grains were coarse and asymmetricaly.So,incorrect fabricating process,such as the lower final forging temperature and normalized tempering temperature is the main cause.Measures were put forward to assure the heat exchanger quality.

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Reference：

[1]李慧峰.冷镦钢产品顶锻开裂的机理分析及应用[J].锻压技术,2006,31(2):1-4.
[2]牟华,高锦张,贾俐俐.冷锻过程局部镦粗规则的研究及应用[J].锻压技术,2006,31(2):78-81.
[3]张利鹏,刘智冲.筒形件强力旋压工艺参数选取方式分析[J].锻压技术,2006,31(1):43-47.

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