Certificates

WYJ001-2003                 20MnMo

1. The technology conditions apply to thickness 100 ~ 250 mm thick 20 MnMo steel plates.

2. The size, shape, weight and deviation should be allowed to meet the provisions of GB709-88.

3. Technical requirements

3.1 the chemical composition of steel (melting analysis) shall conform to the provisions of the table 1 standard

Chart 1 （Wt％）

 

Steel grade	C	Si	Mn	Mo	P	S	Cr	Ni	Cu	Ceq
20MnMo	0.17～0.23	0.17～0.37	1.10～1.40	0.20～0.35	≤0.025	≤0.010	≤0.30	≤0.30	≤0.25	≤0.55

Note: (1) V, Ti Nb and micro alloying elementscan be alloyed when necessary,.

(2) Ceq = C + Mn / 6 + (Mo + Cr + V) / 5 + (Ni + Cu) / 15

3.2 delivery status: the normalized + tempering delivery

3.3 mechanical properties

3.3.1 tensile and impact performance should be consistent with the table 2 standard

Chart 2

 

Steel grade	σs MPa	σb MPa	δ50 ％	Normal horizontalAKU J	provide 0℃ Akv
20MnMo	≥370	530～680	≥18	≥41

 

3.3.2 "Z" to the performance: ψquartile 15%