Steel Suggestion for Non-Heat Treated Fasteners
Steel Suggestion for Non-Heat Treated Fasteners
(OP)
Hi all,
I just have a quick question. We have a line of fasteners (0.200" diameter) that are normally made from 10B21 and hardened to 28-34 HRc via heat treatment. We also make the same fasteners from cold worked 316 and are able to achieve the same hardness. The idea came up that we should look at eliminating our heat treatment on 10B21 by selecting a cold worked material that has a hardness of 28-34 HRc as-received. Would there be any negatives to this approach? Other than the fact that rolling threads on a harder material will wear the die out quicker, does this seem like a feasible approach? Or will material cold worked to 28-34 HRc have terrible ductility/impact resistance when compared to a heat treated 10B21? Also what cheap materials should we look into that could satisfy these requirements?
Thanks,
M
I just have a quick question. We have a line of fasteners (0.200" diameter) that are normally made from 10B21 and hardened to 28-34 HRc via heat treatment. We also make the same fasteners from cold worked 316 and are able to achieve the same hardness. The idea came up that we should look at eliminating our heat treatment on 10B21 by selecting a cold worked material that has a hardness of 28-34 HRc as-received. Would there be any negatives to this approach? Other than the fact that rolling threads on a harder material will wear the die out quicker, does this seem like a feasible approach? Or will material cold worked to 28-34 HRc have terrible ductility/impact resistance when compared to a heat treated 10B21? Also what cheap materials should we look into that could satisfy these requirements?
Thanks,
M





RE: Steel Suggestion for Non-Heat Treated Fasteners
RE: Steel Suggestion for Non-Heat Treated Fasteners
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Steel Suggestion for Non-Heat Treated Fasteners
We could also look into using an alloy steel if the price was still cheaper than heat treated 10B21.
RE: Steel Suggestion for Non-Heat Treated Fasteners
You will not get the degree of work hardening that you need with any straight carbon steel, you will need alloying and a special mill heat treat to give you a unique micro structure that has ductility for heading and also strength.
RE: Steel Suggestion for Non-Heat Treated Fasteners
1025 grades are available in hot rolled condition .
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Steel Suggestion for Non-Heat Treated Fasteners
They are often used in the cold worked stress relieved condition. You are not going to a very high hardness.
These steels may cost more but you would loose the heat treatment.
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Plymouth Tube
RE: Steel Suggestion for Non-Heat Treated Fasteners
Cold heading quality low-carbon ultra-high- strength bainitic steels (Coheadbain)
http://www.swiss-steel.com/fileadmin/files/swiss-s...
Micro-alloyed steels for non heat treated ball studs and pins
http://www.swiss-steel.com/fileadmin/files/swiss-s...
8MnSi7 - Saarform 800
http://www.saarstahl.com/fileadmin/saarstahl_extra...
30MnVS6 (27MnSiVS6) - Saarform 900
http://www.saarstahl.com/fileadmin/saarstahl_extra...
Technological Properties of the New High Strength Bainitic Steel 20MnCrMo7
http://www.ezm-mark.de/index.php?id=1103