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crajkumar
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Join Date: Nov 2009
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13%Cr vs 316SS

05/09/2010 6:58 AM

1. What is the difference between 13% Chromium and 316SS?

The gate valve data sheet shows the stem material ia 13% Cr. But the vendor offer is 316ss. which one is good.

2. And what material is 13% Cr ?
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lyn
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#1

Re: 13%Cr vs 316SS

05/09/2010 9:06 AM

Stainless Steel - Grade 316 - Properties, Fabrication and Applications

You'll have to do the research yourself.
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Tornado
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#2

Re: 13%Cr vs 316SS

05/09/2010 5:33 PM

SS316 contains 16-18% Cr (chromium).

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NAVEED ATHAR
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#3

Re: 13%Cr vs 316SS

05/10/2010 1:12 AM

1- SS 316 and its variants generally contain 11-12% Ni along with 17% Cr to which about 2.5% Mo is added to improve its acid resistance.

2- A material claimed to be containing 13% Cr means, in effect, nothing much to a user unless the other materials within it are specified, which as a whole, would determine its properties.

3- Since the general knowledge on metallurgy is weak therefore this situation is exploited by many suppliers by mentioning Cr which indicates some sort of chemical resistance.
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crajkumar
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#5
In reply to #3

Re: 13%Cr vs 316SS

05/10/2010 4:36 AM

Thank u.
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RHABE
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#4

Re: 13%Cr vs 316SS

05/10/2010 1:13 AM

Hi,

13%Cr is ferritic/martensitic if low Nickel content and thus is hardenable. Good for high contact stress as in ball-bearings and tools. See data of 440C. High strength, medium ductility. Complicated heat-treatment if good dimensional stability is needed.

316SS or comparable 1.4401 or 1.4404 is austenitic, thus not hardenable by heat-treatment, but by Mo-content still higher strength compared to more ordinary SS. No heat treatment to gain strength npossible, not particularly stable, not intended for precision parts. But still good for sliding bearings if no fretting condition is achieved. Very good corrosion resistance in chloride solutions.

RHABE
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viki_friend
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#6

Re: 13%Cr vs 316SS

05/11/2010 10:09 AM

316SS is superior than 13% Cr.

316ss contains 18% Cr.

check with the vendor that there is no cost implication for changing to 316SS.

A276 gr 410, A240 TP 410 are more commonly used 13% CR materials.
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msamad
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#7
In reply to #6

Re: 13%Cr vs 316SS

05/11/2010 4:01 PM

In fact, 13% chromium doesn't specify the quality of any specific stainless steel (SS), while 316 does. The stainless steel may contain 13% chromium but may not have other good components such as 10% nickel and 2% molybdenum (the molybdenum is added to help resist corrosion to chlorides like sea water and de-icing salts). As other contributors already indicated, 316 SS is better than 13% chromium SS in terms of quality.

However, 316 SS contains 10% nickel which makes it non-magnetic. All 300 series SS is non-magnetic. So, if your requirement is magnetic SS, you need to select 400 series (without nickel contents) which has the ferritic (magnetic) property. But most probably it may not be the requirement for the gate valve.

See these links for more details:

http://www.machinist-materials.com/stainless_table.htm

http://www.ssina.com/faq/index.html

http://www.bosunsupplies.com/stainlessinfo2.cfm

- MS

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Kwetz
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#8

Re: 13%Cr vs 316SS

05/13/2010 2:44 PM

13% Cr steels (400 series) are commonly specified for valve stems, usually 410 type.

As already explained, 400 series are stainless but not austenitic as 316 type is because of the addition of Ni. I've see much more valves with martensitic SS stems (Tp 410, 17-4 PH or grade 630, etc.)than with austenitic ones.

To evaluate the validity of material change respect the valve data sheet, some engineering judgement is necessary about the stem stresses (tension, buckling...) and the resistance to the medium which is not specified (nor the body material, rating, etc)

Without such data it's not possible to take a decision on the validity of such a change.

Kind regards

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strider6
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#9

Re: 13%Cr vs 316SS

05/19/2010 6:31 AM

which one is good depends on the type of service and operating conditions.. you should ask the vendor if he has considered the corrosion resistance of the two materials in your service..

S

corrosion control
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ashfaqanwer
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#10
In reply to #9

Re: 13%Cr vs 316SS

05/26/2010 8:23 AM

SS316 is austenitic SS having higher corrosion resistance as compared to 13Cr. You should consider your requirement in order to make the right decision. If your requirement explicitly says that you require SS316, there is no point in considering 13Cr ferritic/martensitic SS. Regards, Ashfaq Anwer http://thepetrostreet.com
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fusionblr
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Posts: 8
#11

Re: 13%Cr vs 316SS

07/06/2010 10:19 AM

Dear Sir,

SS 316 has 18-20% Cr, 10-12% Ni & 2.5% Mo. The microstructure is mainly Austenite with 6-9% ferrite.

While 13% Cr Stainless Steels can be heat treated to a hardness of 45-48HRC & is mainly used for PVC Moulding.

Fusion
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Anonymous Poster
#12
In reply to #11

Re: 13%Cr vs 316SS

08/19/2010 2:49 AM

Be careful with SS316 if it is a Chloride environment
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fusionblr
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Posts: 8
#13

Re: 13%Cr vs 316SS

08/20/2010 7:04 AM

Dear Rajkumar,

1. Cost wise 13%Cr is cheaper. It is basically SS410 or SS420. They are heat treatable to 40-45HRC. ( Approx. 0.3-0.35%C, 13-14%Cr )

2. Qualitywise SS316L is better ( Higher % of Cr, Ni & Mo ) & pricewise maybe higher than 13% Cr. If there is any direct contact with chloride media like Hydro Chloric Acid. Better go for SS 420.

Satish
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Anonymous Poster (1); ashfaqanwer (1); crajkumar (1); fusionblr (2); Kwetz (1); lyn (1); msamad (1); NAVEED ATHAR (1); RHABE (1); strider6 (1); Tornado (1); viki_friend (1)

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