Stainless Steel Machining Data

General Machining Guidelines

Type No.UNS No.Machinability*Drawing or StampingWelding
301S3010040%GoodVery good, tough welds.
302S3020040%GoodVery good, tough welds.
303S3030070%Fairly GoodFusion welding not recommended.
304S3040045%Very GoodVery good, tough welds.
304LS3040344%Very GoodVery good, recommend for welding.
316S3160045%GoodVery good, tough welds.
316LS3160345%GoodVery good, recommended for welding.
321S3210038%GoodVery good, tough welds.
410S4100060%Fairly GoodFair, pre-heat 400-500°F Anneal 1250°F after welding.
416S4160085%FairPoor, pre-heat 400-500°F, Anneal 1250°F after welding.
420S4200052%
430FS4302085%
440CS4400440%Not RecommendedNot Recommended
17-4S1740040%Very good, tough welds.
Type No.UNS No.Machinability*Drawing or StampingWelding
301S3010040%GoodVery good, tough welds.
302S3020040%GoodVery good, tough welds.
303S3030070%Fairly GoodFusion welding not recommended.
304S3040045%Very GoodVery good, tough welds.
304LS3040344%Very GoodVery good, recommend for welding.
316S3160045%GoodVery good, tough welds.
316LS3160345%GoodVery good, recommended for welding.
321S3210038%GoodVery good, tough welds.
410S4100060%Fairly GoodFair, pre-heat 400-500°F Anneal 1250°F after welding.
416S4160085%FairPoor, pre-heat 400-500°F, Anneal 1250°F after welding.
420S4200052%
430FS4302085%
440CS4400440%Not RecommendedNot Recommended
17-4S1740040%Very good, tough welds.

*Based on Beesemer Screw Stock No. B1112

Type No.Approximate SFM% Relative Speed (Based on C1212 as 100%)Machinability*
3031507570%
304704045%
304L704044%
316/316L603645%
321603638%
347603638%
410955460%
416 Ann.1507585%
416 HT855085%
418 (Greek Ascoloy)965050%
420855052%
420F1256868%
4301106660%
430F1507585%
430804845%
440A654045%
440C654040%
440FSE804850%
13-8 PH603640%
15-5 PH754545%
17-4 PH754545%
17-4 PH H1150855045%
17-7 PH502225%
Nitronic 40502225%
Nitronic 50502225%
Nitronic 60502225%
Type No.Approximate SFM% Relative Speed (Based on C1212 as 100%)Machinability*
3031507570%
304704045%
304L704044%
316/316L603645%
321603638%
347603638%
410955460%
416 Ann.1507585%
416 HT855085%
418 (Greek Ascoloy)965050%
420855052%
420F1256868%
4301106660%
430F1507585%
430804845%
440A654045%
440C654040%
440FSE804850%
13-8 PH603640%
15-5 PH754545%
17-4 PH754545%
17-4 PH H1150855045%
17-7 PH502225%
Nitronic 40502225%
Nitronic 50502225%
Nitronic 60502225%

*Based on Bessemer Screw Stock No. B1112

Fabrication Properties

Machinability Ratings