GB standard steel grades said examples illustrate the classification

Steel product brand representation, our country's existing two voluntary national standards, namely GB/T 221-2000 "steel product brand said method" and GB/T 17616-1998 "iron and steel unified digital code system". The former still use Chinese pinyin, chemical symbol and Arabic Numbers with the principle of combining the naming steel grades, the latter requiring all listed in the national standard and professional standard of steel product, shall be included in the product brand and unified digital code, mutual control tied for use.

1) standards used in chemical symbol table 1.

 

Element names	Chemical symbol	Element names	Chemical symbol
铁	Fe	铋	Bi
锰	Mn	铯	Cs
铬	Cr	钡	Ba
镍	Ni	镧	La
钴	Co	铈	Ce
铜	Cu	钐	Sm
钨	W	锕	Ac
钼	Mo	硼	B
钒	V	碳	C
钛	Ti	硅	Si
铝	Al	硒	Se
铌	Nb	碲	Te
钽	Ta	砷	As
锂	Li	硫	S
铍	Be	磷	P
镁	Mg	氮	N
钙	Ca	氧	O
锆	Zr	氢	H
锡	Sn	混合稀土	RE
铅	Pb

2) the alloy steel, low alloy steel and alloy steel element content provisions boundaries (excerpt from GB/G/T 13304-1991) in table 2.

No.	Alloy elements	Alloy element content provisions boundaries (mass fraction) (%)
		The alloy steel <	Low alloy steel	Quartile alloy steel≥
1	Al	0.10	－	0.10
2	B	0.0005	－	0.0005
3	Bi	0.10	－	0.10
4	Cr	0.30	0.30～＜0.50	0.50
5	Co	0.10	－	0.10
6	Cu	0.10	0.10～＜0.50	0.50
7	Mn	1.00	1.00～＜1.40	1.40
8	Mo	0.05	0.05～＜0.10	0.10
9	Ni	0.30	0．30～＜0.50	0.50
10	Nb	0.02	0.02～＜0.06	0.60
11	Pb	0.04	—	0.40
12	Se	0.10	—	0.10
13	Si	0.50	0.50～＜0.90	0.90
14	Te	0.10	—	0.10
15	Ti	0.05	0.05～＜0.13	0.13
16	W	0.10	—	0.10
17	V	0.04	0.04～＜0.12	0.12
18	Zr	0.02	0.05～＜0.12	0.12
19	La	0.02	.05～＜0.12	0.05
20	P、S、C、N	0.05	—	0.05

Note: 1. La series element content, also can be mixed re total content.
2. When Cr, Cu, Mo, Ni (Nb, Ti, V, Zr) of the four elements, including two, three or four elements also be set in when steel, low alloy steel for, should also consider these elements of the provisions of the content of each element, all these elements of the total content of regulations, provisions shall not be more than two, three or four elements in the highest boundary value ZhouQiLv each the combined total of 70%. If these elements of the provisions of the regulations of the element content sum greater than each element limit value of the highest total 70%, even though these elements each element of the highest provisions below plus specified amount limit value, also should delimit alloy steel. The number of Chinese characters and Chinese pinyin symbols to table 3