[MW:25131] RE: 25120] Re: 16160] Difference between IS 1367 Gr. 4.6, 8.8 & 10.9

I am surprised. You appear to be about to make high tensile bolts, but do not understand the grade designation and are asking others to do your material selection for you, and without mentioning the diameter of the bolt which is a critical factor in getting the properties. Making bolts which are fit for service requires in-depth understanding of all aspects of the job.

Alan Denney

AKD Materials Consulting Ltd

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ajith Kumar
Sent: 19 July 2016 07:27
To: Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:25120] Re: 16160] Difference between IS 1367 Gr. 4.6, 8.8 & 10.9

Hello, This information is very usefull.

Currently I have a requirement to produce M8 --8.8 grade Bolt.

Can I select material C40 for the same.

Ajith

On Friday, December 7, 2012 at 5:15:19 PM UTC+5:30, scb wrote:

Mr.Bhaskar,

This is fastener standard for bolts
Grade 8.8 means , Approx. 800 MPa TS and 640 MPa yield strength( you will arrive at the YS by multiplying the both the numbers times 10. That is 8x8x10=640)
Similarly , 10.9 means approx.1000 MPa TS and 900 MPa yield strength. I have given below the exact details.

Property Class
Tensile strength,Mpa
Hardness
Material
heat treatment
tempering
4.6
400
B67-B87
low or medium carbon steel witth max limits for C 0.55, P0.048, S0.058
no

4.8
420
B71-B87
5.8
520
B82-B95
8.8
830
C23-C34
medium carbon steel with max limits for C0.28- 0.55, P0.048, S0.058
oil quenched
min 425 deg C
9.8
900
C27-C36
min 410 deg C
10.9
1040
C33-C39
min425 deg C
12.9
1220
C38-C44
medium carbon steel with max limits for C0.31- 0.65, P 0.045 MAX, S 0.045MAX
oil quenched
min 380deg C

I hope this will clarify your point. If any questions please don't hesitate to write.

Regards,

S C Balawat.
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of v baskar
Sent: Friday, December 07, 2012 3:01 PM
To: material...@googlegroups.com
Subject: [MW:16160] Difference between IS 1367 Gr. 4.6, 8.8 & 10.9

Dear Members,

I would like to know difference between IS 1367 Gr. 4.6, 8.8 & 10.9
What does "4.6", 8.8 and "10.9" means.......

Thankyou

V. B.
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