34CrNiMo4

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1. CHEMICAL COMPOSITION % of 34CrNiMo4

	C	Si	Mn	Ni	Cr	Mo	S	P	Al
min	0.30		0.50	1.30	1.30	0.15
max	0.38	0.40	0.80	1.70	1.70	0.30	0.035	0.035

 
2. STEEL MAKING PROCESS of 34CrNiMo4
 
a) Steel is melted in Electrical Arc Furnaces. 
b) Vacuum degassing required. 
c) Bottom poured ingots to be used. 
3. MACROSTRUCTURE  of 34CrNiMo4
· Internal defects on the transverse slice using hot hydrochloric acid macro etching should comply as per ASTM  E381.
· Macro structure shall conform to rating S-2, R-2, C-2.
· The non metallic inclusion determination shall be in accordance with ASTM  E45
 (Method A) 
· The grain size shall be in accordance to ASTM  E 112-96 Specification and must exceed Grade 5. 
4. SURFACE DEFECTS of 34CrNiMo4
Surface cracks and defects on all rolled bars shall be detected using Eddy Current Testing Method.