介紹常見彈簧不銹鋼種類、不銹鋼線材、包含了不銹鋼304、不銹鋼301、不銹鋼316…等等

Austenitic Stainless Steel
The most commonly seen 304 stainless steel is this type of stainless steel. Its standard composition is 18% chromium and 8% nickel, which is generally called 18-8 stainless steel. The characteristics of this type of stainless steel are non-magnetic, its metallographic structure cannot be changed by heat treatment, and its workability is good. Because it contains an alloying element-nickel, its corrosion resistance is better than that of chromium-only (nickel-free). The other two types of stainless steel. The main uses of 300 series stainless steel are: general civilian use such as kitchen tableware, building materials, medical and health equipment, food processing materials, transportation, chemical equipment and pipe fittings, mechanical equipment and parts. For ordinary people, the so-called stainless steel refers to 300 series stainless steel (especially 304 stainless steel).
Name	Hardness Number	Characteristic
		Hardness (HV)	Tensile strength (N/mm2)	Yield strength (N/mm2)	Elongation (%)
SUS 301	1/2H	310~370	≧ 930	≧ 510	≧ 10
	3/4H	370~430	≧ 1130	≧ 745	≧ 5
	H	430~490	≧ 1320	≧ 1030	─
	EH	490~530	≧ 1570	≧ 1275	─
	SEH	≧ 530	≧ 1740	≧ 1450	─
SUS 304	O	≦ 200	≧ 520	≧ 205	≧ 40
	1/2H	250~310	≧ 780	≧ 470	≧ 6
	3/4H	310~370	≧ 930	≧ 665	≧ 3
	H	≧ 370	≧ 1130	≧ 880	─
SUS 305	O	≦ 200	≧ 480	≧ 175	≧ 40
SUS 310S	O	≦ 200	≧ 520	≧ 205	≧ 40

SUS 316L	O	≦ 200	≧ 480	≧ 175	≧ 40

Martensitic Stainless Steel
The chemical composition of this type of stainless steel contains 13% chromium, less than 0.15% carbon and a small amount of other element alloys. The raw material is cheap, magnetic, hardened by heat treatment, and increased in strength. However, because it does not contain nickel, its corrosion resistance is inferior to that of ordinary 304 stainless steel, so it can only be used in mildly corrosive environments. General uses include bearings, medical appliances and tools.
Name	Hardness Number	Characteristic
		Hardness (HV)	Tensile strength (N/mm2)	Yield strength (N/mm2)	Elongation (%)
SUS 420J2	O	≦ 247	≧ 540	≧ 225	≧ 18
SUS 440A	O	≦ 200	≧ 450	≧ 205	≧ 22

Ferritic Stainless Steel
The representative grade of this type of stainless steel is 430, its standard chemical composition is 16~18% chromium, and its carbon content is low. This type of stainless steel is magnetic, and if the stainless steel sheet we see can be attracted by a magnet, it is likely to belong to this type of stainless steel. It is less expensive because it does not contain nickel. Typical uses are kitchen utensils, netting and accessories.
Name	Hardness Number	Characteristic
		Hardness (HV)	Tensile strength (N/mm2)	Yield strength (N/mm2)	Elongation (%)
SUS 410L	O	≦ 200	≧ 360	≧ 195	≧ 22
SUS 430	O	≦ 269	≧ 590	≧ 245	≧ 15

Precipitation Hardening Stainless Steel
The American Iron and Steel Institute AISI number is 600 series stainless steel. In addition to chromium and nickel, this type of stainless steel also contains precipitation hardening elements such as copper, aluminum and titanium, which harden the material and increase its strength. Typical uses of this type of stainless steel are: valves, motor shafts, petrochemical equipment and golf heads.
Name	Heat Treatment Number	Characteristic
		Hardness (HV)	Tensile strength (N/mm2)	Yield strength (N/mm2)	Elongation (%)
SUS 630	S	About ≦375	─	─	─
	H900	About ≦396	≧ 1310	≧ 1175	≧ 5
	H1025	About ≦349	≧ 1070	≧ 1000	≧ 5
	H1075	About ≦319	≧ 1000	≧ 860	≧ 5
	H1150	About ≦292	≧ 930	≧ 725	≧ 8

Stainless steel

介紹常見彈簧不銹鋼種類、不銹鋼線材、包含了不銹鋼304、不銹鋼301、不銹鋼316…等等