UKF Stainless - Cold Working


Search the Site:

Advanced Search

Home

Company

Products

Services

Quality

Technical

- Overview

- The Stainless Family

- Physical & Mechanical Properties

- Corrosion Resistance

- Fabrication

- Specification & Designations

Contact

Downloads

Mailing Address

UKF Stainless Ltd
12 Buntsford Park Road
Bromsgrove
Worcestershire
B60 3DX

Telephone / Fax

Tel:	01527 578686
Fax:	01527 837792

info@ukfstainless.co.uk

UKF Newsletter

Cold Working

Austenitic chromium-nickel stainless steels develop high strengths when cold worked.

The following designations of cold worked tempers have been established for stainless steel sheet, strip, plate and flat bar
(ASTM A666):

1/16 Hard

1/8 Hard

1/4 Hard

1/2 Hard

3/4 Hard

Full Hard

Properties for Sheet, Strip, Plate & Flat Bar:

Minimum Properties of UNS S30100, S30200, S304xx, S316xx Grades
Temper	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%) on 50mm
			S30100	Other
1/16 Hard	310	550-620*	40	35-40*
1/8 Hard	380	690	40	25-37*
1/4 Hard	515	860	25	8-12*
1/2 Hard	760	1035	15-18*	5-10*
3/4 Hard	930	1205	10-12*	5-6*
Full Hard	965	1275	8-9*	3-4*
* minima may vary with thickness and grade.

Properties for Wire:

Some Properties of Cold Drawn 3.2-9.5mm Diameter wire
Ranges include S30200, S30400, S32100, S31600, S34700, S30900, S31000 grades.
Temper	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
1/4 Hard	550-860	760-960	15-30
1/2 Hard	720-1030	860-1170	10-20
3/4 Hard	860-1240	960-1380	5-12
Full Hard	1030-1520	1100-1650	2-8
Drawing wire to smaller diameters may produce higher strength and lower elongation values.

Influence of Cold Work and Nickel Content on Properties:

Minimum Properties of UNS S30100, S30200, S304xx, S316xx Grades
Percentage cold reduction
	0	10	20	30	40	50	60
17%Cr 7%Ni (S30100)
Tensile	830	1030	1160	1270	1360	1450	1530
Yield	280	600	830	1020	1170	1280	1390
Elongation	75	58	42	32	22	15	6

17%Cr 9-12%Ni (MoTiNb) (S30200,S304xx,S31600,S32100,S34700)
Tensile	570-660	660-750	760-840	900-990	980-1100	1030-1170	1170-1240
Yield	220-280	480-630	670-750	810-880	880-950	950-1050	1000-1100
Elongation	50-67	33-45	12-30	8-20	7-15	5-10	4-6

24%Cr 14-20%Ni (S30900 and S31000)
Tensile	550-590	600-740	680-870	790-960	930-1050	1040-1140	1140-1200
Yield	250-310	390-460	570-670	700-860	840-960	960-1020	1050-1060
Elongation	45-55	29-45	15-30	8-14	6-9	4-6	3-5
Tensile and Yield strengths are quoted in MPa. Elongation is in %.

Influence on Fatigue Strength:

Influence of Cold Work on Fatigue Strength
Cold working increases the fatigue strength of the austenitic stainless steels. However, the fatigue strength of these cold worked alloys is reduced by notches, as compared to notched fatigue strength in the annealed condition. Fatigue strength (endurance limits) of Cold Worked Stainless Steels
UNS	Temper	Endurance Limit (MPa)
S30100	Full Hard	550
S30200	Full Hard	520
S30300	1/4 Hard	330
S30400	1/2 Hard	480
S30400	3/4 Hard	640
S34700	3/4 Hard	610

Reheating cold worked austenitic stainless steels at temperatures below 350°C increases the tensile strength. Reheating above 400°C lowers the strength and increases the ductility.

Page Last Modified: 10/04/06 14:00