303S31 - BS 970-3-1991

Grade	303S31
Corresponding Standard	BS 970-3-1991 Specification for wrought steel for machanical and allied engineering purposes part 3:bright bars for general engineering purposes
Classification	Austenitic Stainless Steel
Properties	Strength Corrosion Resistance Low-Temperature Toughness Impact Toughness Forgability Machinability

303S31 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu ^*	Mo ^©	Ti ^*	Nb ^*
Minimum Value	-	-	-	-	0.15	17	8	-	-	-	-
Maximum Value	0.12	1	2	0.06	0.35	19	10	0.7	1	0.1	0.2

• For older grades of stainless steel, see Table 2 of standard BS 970-4-1970

* Residual elements
© Optional addition.

303S31 Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %
Bars; d≤19	Cold Drawing	≥865	≥695	≥12
Bars; 19<d≤25	Cold Drawing	≥790	≥555	≥15
Bars; 25<d≤32	Cold Drawing	≥725	≥450	≥20
Bars; 32<d≤38	Cold Drawing	≥695	≥340	≥28
Bars; 38<d≤45	Cold Drawing	≥650	≥310	≥28
Bars; d≤19	Annealing Treatment, Final Cold Drawing	≥600	≥375	≥15
Bars; d>19	Annealing Treatment, Final Cold Drawing	≥550	≥325	≥20
Bars; d<160	Final Softening*	≥510	≥190	5.65√S0 ≥40

Approximate Comparison Table Ferritic Stainless Steel

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!