The effect of previous cold deformation on the mechanical properties of tempered pipes from D16 alloy

Conclusions

• 1. The wall thickness (1–3 mm) has no effect on the mechanical properties of pipes of D16 alloy.

• 2. Increase in the extent of cold deformation before tempering to 70% raises the strength characteristics of the pipes considerably; the value of the relative elongation hereby is in accordnace with GOST 4773-49. Further increase in the degree of deformation does not improve the mechanical properties of the pipes.

• 3. Minimum values of the degree of preliminary deformation which ensure obtaining yield point values meeting GOST 4773-49 have been established.