Austenitic Stainless Steel Chemical Composition, Grade Chart, Tables and Documents

Austenitic stainless steels are strong corrosion-resistant alloys which are based on the chemical composition with high level of chromium and nickel, as additional manganese and nitrogen are used for stability and enhanced strength. As for the grades, which are represented by the numbers 304, 316, and 321, each features its own chemical composition targeted for different applications. Grade tags mostly on features like strength of tensile, resistance to corrosion and also temperature tolerance. The information in the tables contains comparative material on the elements of its composition, mechanical properties, and applications. In the case of the austenitic stainless steel spread sheets contain the technique of fabrication, welding performance, and industry criteria. These resources are helpful to engineers and manufacturers in choosing materials from the different grades depending on the environment, say food plants and chemical processing plants, which will determine the durability and performance in tough circumstance.

Chemical composition* (weight %) and PREN of some common standard wrought 300 and 200 series austenitic stainless steels

Austenitic stainless steel is a common choice for corrosion resistance and durability, historically involving 8-10.5% nickel, 18-20% chromium, and iron. Moreover, it is also composed of manganese, silicon, nitrogen and carbon among many others in differing percentages as well. The addition of manganese increases the cast iron's ductility, while the silicon contributes to the process of de-oxidization. An example of such is said to be nitrogen element which enables better strength and corrosion resistance, while the carbon content gives either hardness or machinability. They can have Mo and Cu, which enhance the resistance to pitting corrosion or delivering good weldability. The unique variety of this alloy provides a number of different compositions sought out for different purposes like kitchenware or industry machinery.

Austenitic Stainless Steel Composition Table

Grade	No.	UNS	EN No.	C	N	Cr	Ni	Mo	Cu	Other	PREN***
Representative standard grades - 300 series
304	S30400	1.4301	0.07	2.00	0.10	17.5 19.5	8.0 10.5	-	-	-	18-20
304L	S30403	1.4307	0.03	2.00	0.10	17.5 19.5	8.0 12.0	-	-	-	18-21
321	S32100	1.4541	0.08	2.00	0.10	17.0 19.0	9.0 12.0	-	-	Ti 5x(C+N)min., 0.70 max.	18-21
347	S34700	1.4550	0.08	2.00	0.10	17.0 19.0	9.0 13.0	-	-	Nb 10xC min., 1.00 max	18-21
316	S31600	1.4401	0.08	2.00	0.10	16.0 18.0	10.0 14.0	2.00 3.00	-	-	24-26
316L	S31603	1.4404	0.03	2.00	0.10	16.0 18.0	10.0 14.0	2.00 3.00	-	-	24-26
-	-	1.4435	0.03	2.00	0.11	17.0 19.0	12.5 15.0	2.50 3.00	-	-	27-29
317L	S31703	1.4438	0.03	2.00	0.10	18.0 20.0	11.0 15.0	3.00 4.00	-	-	29-30
Representative standard grades - 200 series
201	S20100	1.4372	0.15	5.5 7.5	0.25	16.0 18.0	3.5 5.5	-	-	-	17-20
201L	S20103	-	0.03	5.5 7.5	0.25	16.0 18.0	3.5 5.5	-	-	-	17-20
201LN	S20153	-	0.03	6.4 7.5	0.10 0.25	16.0 17.5	4.0 5.0	-	1.0	-	17-20

Chemical composition* (weight %) and PREN of some common standard wrought 300 and 200 series austenitic stainless steels

Austenitic Stainless Steel Composition Table

Grade	No.	UNS	EN No.	C	N	Cr	Ni	Mo	Cu	Other	PREN***
Alloy 20	N08020	2.4660	0.07	2.00	-	19.0 21.0	32.0 38.0	2.00 3.00	3.00 4.00	(Nb+Ta): 8xC min., 1.00 max.	25-27
317LM	S31725	-	0.03	2.00	0.20	18.0 20.0	13.2 17.5	4.00 5.00	-	-	30-32
317LMN	S31726	1.4439	0.03	2.00	0.10 0.20	17.0 20.0	13.5 17.5	4.00 5.00	-	-	31-33
904L	N08904	1.4539	0.02	2.00	0.10	19.0 23.0	23.0 28.0	4.00 5.00	1.00 2.00	-	33-35
-	S31727	-	0.03	1.00	0.15 0.21	17.5 19.0	14.5 16.5	3.80 4.50	2.80 4.00	-	33-35
-	N08028	1.4563	0.02	2.00	0.15 0.25	26.0 28.0	30.0 34.0	3.00 4.00	-	-	38-40
-	S34565	1.4565	0.03	5.00 7.00	0.40 0.60	23.0 25.0	16.0 18.0	4.00 5.00	-	-	45-47
-	N08026	-	0.03	1.00	0.10 0.16	22.0 26.0	33.0 37.2	5.00 6.70	2.00 4.00	-	41-43
-	S32053	-	0.03	1.00	0.17 0.22	22.0 24.0	24.0 26.0	5.00 6.00	-	-	41-43
-	N08926	1.4529	0.02	2.00	0.15 0.25	19.0 21.0	24.0 26.0	6.00 7.00	0.50 1.50	-	41-43
-	S31254	1.4547	0.02	1.00	0.18 0.22	19.5 20.5	17.5 18.5	6.00 6.50	-	-	41-43
-	N08367	-	0.03	2.00	0.18 0.25	20.0 22.0	23.5 25.5	6.00 7.00	0.75	-	43-45
-	S31266	1.4659	0.03	2.00 4.00	0.35 0.60	23.0 25.0	21.0 24.0	5.20 6.20	1.00 2.50	W: 1.5-2.5	48-59
-	S31277	-	0.02	3.00	0.30 0.40	20.5 23.0	26.0 28.0	6.50 8.00	0.50 1.50	-	47-49
-	N08031	1.4562	0.02	2.00	0.15 0.25	26.0 28.0	30.0 32.0	6.00 7.00	1.00 1.40	-	48-50
-	N08354	-	0.03	1.00	0.17 0.24	22.0 24.0	34.0 36.0	7.00 8.00	-	-	48-50
-	N08935	-	0.03	1.20	0.25 0.36	26.0 28.0	34.0 36.0	6.10 7.10	0.4	-	50-53
-	S32654	1.4652	0.02	2.00 4.00	0.45 0.55	24.0 26.0	21.0 23.0	7.00 8.00	0.30 0.60	-	54-56

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