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30CrNiMo8 Round Bar

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Round Bar

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Alloy steel astm a193 grade b7 / aisi 4140 / sae 4140 / 42CrMo4 material is considered as the most suitable for botls and nuts to be used at temperature below 450 degree C, with a minimum effect on its structural strength during application at a high temperature.

Advantages of astmastm a193 grade b7 / aisi 4140 / sae 4140 / 42CrMo4 qt steel round bar for gr 10.9 bolts we supply:

1): Smooth surface: Smooth surface without any cracks or scales

2): Good straightness: 1mm for hot rolled + QT bars and 0.5mm for cold drawn +QT bars

3): Uniform microstructure and mechanical properties

4): Anti-rusty packages: two layers packages and load in cntainer in our factory in case rusty and package damage.

5): Fast delivery time: Within two weeks if there is stock, within one month to customize.

Detailed astm a193 grade b7 / aisi 4140 / sae 4140 / 42CrMo4 steel specification:

1. astm a193 grade b7 / aisi 4140 alloy steel chemical composition:

C	SI	MN	S	P	CR	MO
0.37-0.49	0.15-0.35	0.70-1.10	0.035(MAX)	0.035(MAX)	0.75-1.20	0.15-0.25

2. astm a193 b7 / aisi 4140 alloy steel mechanical property:

Dia	Minimum temperature	Tensile strength	Yield strength	Elongation	Reduction of area	Hardness
Below 65mm	593 ° C	860	720	16	50	35 HRC
65mm to 100mm	593 ° C	795	655	16	50	35 HRC
100mm to 160mm	593 ° C	690	510	18	50	29 HRC