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ASTM A403/ASME SA403 CHEMICAL REQUIREMENTS (Composition, %)
Grade WP	Grade CR	UNS	CB	Mn	P	S	Si	Ni	Cr	Mo	Ti	N2C	Others
WP XM-19	CR XM-19	S20910	0.06	4.0–6.0	0.045	0.03	1	11.5–13.5	20.5–23.5	1.50–3.00	. . .	0.20–0.40	D
WP 304	CR 304	S30400	0.08	2	0.045	0.03	1	8.0–11.0	18.0–20.0	. . .	. . .	. . .	. . .
WP 304L	CR 304L	S30403	0.030E	2	0.045	0.03	1	8.0–12.0	18.0–20.0	. . .	. . .	. . .	. . .
WP 304H	CR 304H	S30409	0.04–0.10	2	0.045	0.03	1	8.0–11.0	18.0–20.0	. . .	. . .	. . .	. . .
WP 304N	CR 304N	S30451	0.08	2	0.045	0.03	1	8.0–11.0	18.0–20.0	. . .	. . .	0.10–0.16	. . .
WP 304LN	CR 304LN	S30453	0.03	2	0.045	0.03	1	8.0–11.0	18.0–20.0	. . .	. . .	0.10–0.16	. . .
WP 309	CR 309	S30900	0.2	2	0.045	0.03	1	12.0–15.0	22.0–24.0	. . .	. . .	. . .	. . .
WP 310S	CR 310S	S31008	0.08	2	0.045	0.03	1	19.0–22.0	24.0–26.0	. . .	. . .	. . .	. . .
WP S31254	CR S31254	S31254	0.02	1	0.03	0.01	0.8	17.5–18.5	19.5–20.5	6.0–6.5	. . .	0.18–0.22	Cu 0.50–1.00
WP 316	CR 316	S31600	0.08	2	0.045	0.03	1	10.0–14.0	16.0–18.0	2.00–3.00	. . .	. . .	. . .
WP 316L	CR 316L	S31603	0.030E	2	0.045	0.03	1	10.0–14.0F	16.0–18.0	2.00–3.00	. . .	. . .	. . .
WP 316H	CR 316H	S31609	0.04-0.10	2	0.045	0.03	1	10.0–14.0	16.0–18.0	2.00–3.00	. . .	. . .	. . .
WP 316N	CR 316N	S31651	0.08	2	0.045	0.03	1	10.0–13.0	16.0–18.0	2.00–3.00	. . .	0.10–0.16	. . .
WP 316LN	CR 316LN	S31653	0.03	2	0.045	0.03	1	10.0–13.0	16.0–18.0	2.00–3.00	. . .	0.10–0.16	. . .
WP 317	CR 317	S31700	0.08	2	0.045	0.03	1	11.0–15.0	18.0–20.0	3.0–4.0	. . .	. . .	. . .
WP 317L	CR 317L	S31703	0.03	2	0.045	0.03	1	11.0–15.0	18.0–20.0	3.0–4.0	. . .	. . .	. . .
WP S31725	CR S31725	S31725	0.03	2	0.045	0.03	1	13.5–17.5	18.0–20.0	4.0–5.0	. . .	0.2	. . .
WP S31726	CR S31726	S31726	0.03	2	0.045	0.03	1	13.5–17.5	17.0–20.0	4.0–5.0	. . .	0.10–0.20	. . .
WP 321	CR 321	S32100	0.08	2	0.045	0.03	1	9.0–12.0	17.0–19.0	. . .	G	. . .	. . .
WP 321H	CR 321H	S32109	0.04–0.10	2	0.045	0.03	1	9.0–12.0	17.0–19.0	. . .	H	. . .	. . .
WP S33228	CR S33228	S33228	0.04–0.08	1	0.02	0.015	0.3	31.0–33.0	26.0–28.0	. . .	. . .	. . .	Ce 0.05–0.10
													Al 0.025
													Cb 0.6-1.0
WP S34565	CR S34565	S34565	0.03	5.0–7.0	0.03	0.01	1	16.0–18.0	23.0–25.0	4.0–5.0	. . .	0.40–0.60	Cb 0.10
WP 347	CR 347	S34700	0.08	2	0.045	0.03	1	9.0–12.0	17.0–19.0	. . .	. . .	. . .	I
WP 347H	CR 347H	S34709	0.04–0.10	2	0.045	0.03	1	9.0–12.0	17.0–19.0	. . .	. . .	. . .	J
WP 348	CR 348	S34800	0.08	2	0.045	0.03	1	9.0–12.0	17.0–19.0	. . .	. . .	. . .	Cb + Ta p 10 X (C)−1.10
													Ta 0.10
													Co 0.20
WP 348H	CR 348H	S34809	0.04-0.10	2	0.045	0.03	1	9.0–12.0	17.0–19.0	. . .	. . .	. . .	Cb + Ta p8 X (C)−1.10
													Ta 0.10
													Co 0.20
WP S38815	CR S38815	S38815	0.03	2	0.04	0.02	5.5–6.5	15.0–17.0	13.0–15.0	0.75–1.50	. . .	. . .	Cu 0.75-1.50
													Al 0.30

NOTES:

A: See Section 15 for marking requirements.

B:Maximum, unless otherwise indicated.

C:The method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer.

D: Columbium 0.10-0.30%; Vanadium, 0.10–0.30%.

E: For small diameter or thin walls, or both, where many drawing passes are required, a carbon maximum of 0.040% is necessary in grades TP304L and TP316L. Small outside diameter

tubes are defined as those less than 0.500 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.24 mm] in average wall thickness.

F: On pierced tubing, the nickel may be 11.0–16.0%.

G5 X (C + N2) – 0.70.

H4 X (C + N2) – 0.70.

I: The columbium content shall be not less than ten times the carbon content and not more than 1.10%.

J: The columbium content shall be not less than eight times the carbon content and not more than 1.10%.

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