Material Composition is the Key to Customized Precision Castings

material composition is the key to customized precision castings

Many of our customers are often confused by the material grades on the drawings when they are given drawings of the parts they need to purchase. For example, customers who need to purchase silicone casting parts are usually European and American customers, and most of the drawings of European customers are marked with material grades such as 1.4308, 1.4408, etc. For those who are in contact with such material grades for the first time, they can only seek help by using search sites such as Google.

The chart below shows a rough cross-reference of stainless steel grades, but it is not very accurate.

Stainless Steel Grades Around The World

No	China GB			USA		Japan JIS	EU BS EN	Korea KS
	Old	New（07.10）		ASTM	UNS
1	1Cr17Mn6Ni5N		12Cr17Mn6Ni5N	201	S20100	SUS201	1.4372	STS201
2	1Cr18Mn8Ni5N		12Cr18Mn9Ni5N	202	S20200	SUS202	1.4373	STS202
3	1Cr17Ni7		12Cr17Ni7	301	S30100	SUS301	1.4319	STS301
4	0Cr18Ni9		06Cr19Ni10	304	S30400	SUS304	1.4301	STS304
5	00Cr19Ni10		022Cr19Ni10	304L	S30403	SUS304L	1.4306	STS304L
6	0Cr19Ni9N		06Cr19Ni10N	304N	S30451	SUS304N1	1.4315	STS304N1
7	0Cr19Ni10NbN		06Cr19Ni9NbN	XM21	S30452	SUS304N2	-	STS304N2
8	00Cr18Ni10N		022Cr19Ni10N	304LN	S30453	SUS304LN	-	STS304LN
9	1Cr18Ni12		10Cr18Ni12	305	S30500	SUS305	1.4303	STS305
10	0Cr23Ni13		06Cr23Ni13	309S	S30908	SUS309S	1.4833	STS309S
11	0Cr25Ni20		06Cr25Ni20	310S	S31008	SUS310S	1.4845	STS310S
12	0Cr17Ni12Mo2		06Cr17Ni12Mo2	316	S31600	SUS316	1.4401	STS316
13	0Cr18Ni12Mo3Ti		06Cr17Ni12Mo2Ti	316Ti	S31635	SUS316Ti	1.4571	-
14	00Cr17Ni14Mo2		022Cr17Ni12Mo2	316L	S31603	SUS316L	1.4404	STS316L
15	0Cr17Ni12Mo2N		06Cr17Ni12Mo2N	316N	S31651	SUS316N	-	STS316N
16	00Cr17Ni13Mo2N		022Cr17Ni13Mo2N	316LN	S31653	SUS316LN	1.4429	STS316LN
17	0Cr18Ni12Mo2Cu2		06Cr18Ni12Mo2Cu2	-	-	SUS316J1	-	STS316J1
18	00Cr18Ni14Mo2Cu2		022Cr18Ni14Mo2Cu2	-	-	SUS316J1L	-	STS316J1L
19	0Cr19Ni13Mo3		06Cr19Ni13Mo3	317	S31700	SUS317	-	STS317
20	00Cr19Ni13Mo3		022Cr19Ni13Mo3	317L	S31703	SUS317L	1.4438	STS317L
21	0Cr18Ni10Ti		06Cr18Ni11Ti	321	S32100	SUS321	1.4541	STS321
22	0Cr18Ni11Nb		06Cr18Ni11Nb	347	S34700	SUS347	1.4550	STS347
23	0Cr26Ni5Mo2		-	329	S32900	SUS329J1	1.4477	STS329J1
24	00Cr18Ni5Mo3Si2		022Cr19Ni5Mo3Si2N	-	S31803	SUS329J3L	1.4462	STS329J3L
25	0Crl3Al		06Crl3Al	405	S40500	SUS405	1.4002	STS405
26	-		022Cr11Ti	409	S40900	SUH409	1.4512	STS409
27	00Cr12		022Cr12	-	-	SUS410L	-	STS410L
28	1Cr17		10Cr17	430	S43000	SUS430	1.4016	STS430
29	1Cr17Mo		10Cr17Mo	434	S43400	SUS434	1.4113	STS434
30	-		022Cr18NbTi	-	S43940	-	1.4509	-
31	00Cr18Mo2		019Cr19Mo2NbTi	444	S44400	SUS444	1.4521	STS444
32	1Cr12		12Cr12	403	S40300	SUS403	-	STS403
33	1Cr13		12Cr13	410	S41000	SUS410	1.4006	STS410
34	2Cr13		20Cr13	420	S42000	SUS420J1	1.4021	STS420J1
35	3Cr13		30Cr13	-	-	SUS420J2	1.4028	STS420J2
36	7Cr17		68Cr17	440A	S44002	SUS440A	-	STS440A

Drawing on the premise of the table above, we still ask customers to double-check the specific grade of the product, as well as the chemical composition.

For example, the American Standard 304 American National Standard ASTM A312,

the standard chemical composition is as follows.

C ≤ 0.08 Si ≤ 1.0 Mn ≤ 2.0 Cr18.00-20.00 Ni8.00-12.00 S ≤ 0.030 P ≤ 0.045

While 304 corresponds to the EU BSEN standard 1.4301,

the standard chemical composition is as follows.

C≤0.07 Si≤1.0 Mn≤2.0 Cr17.50-19.50 Ni8.00-10.50 S≤0.015 P≤0.045 N≤0.11

The requirements of the four elements C, Cr, S, and N are still slightly different.

Therefore, whether it is our sales staff, or the customer's procurement staff, in the encounter of different countries of material grades, or need to confirm each other specific chemical composition, so as to avoid later sample development and mass production of material quality problems, after all, casting material, that is, chemical composition, is the key to the quality of our casting plant.

To give another example of our recent case.

The final customer's drawing at the time of inquiry stated that the material grade was SCH13, and both we and our customer looked up the chemical composition of SCH13 on Baidu as follows.

C: 0.26-0.35, Si ≤ 1.00 Mn ≤ 1.00 Cr12.00-14.00 S ≤ 0.030 P ≤ 0.035 Ni ≤ 0.6

And after signing the mold contract and sample contract, the final SCH13 chemical composition sent to us by the customer was as follows

C: 0.20-0.50, Si≤2.00 Mn≤2.00 Cr24.00-28.00 S≤0.040 P≤0.040 Ni≤11-14, Mo≤0.50

Needless to say, with such a material gap, our offer is certainly a loss-making mess.

Therefore, the participants in the inquiry stage, whether it is the sales, procurement, or quotation of the technical staff, we are still very worth the time and effort, two-way confirmation of the material composition, and the end customer to confirm the material composition is also a very need to solidify the process.

We hope that the small examples in this issue will bring you some warning to avoid making the same mistakes as we did in the future.