AISI and SUS are the commonly used marks in description of stainless steel wire in China. AISI refers to US Steel Association marks of stainless steel while SUS is used in front of Japan marks indicating it is for special purpose.
Stainless Steel International Standard System
Stainless steel wire has two main standard systems:
Germany - France - Russia System: This system is characterized by its identification of the components in the trademark. China Stainless Steel Trademark adopted the method of the former Soviet Union, the countries belonging to this system also include Italy, Spain, Poland, Romania, the European Union and India.
United States - Britain - Japan System: Its characteristics are concise, clear, easy to remember. From the mark, we can know the organizational structure of the steel. Countries and regions adopting this system include Canada, Brazil, Australia, South Africa, South Korea and China Taiwan Province.
Marks for Stainless Steel Grade of China
1Cr18Ni9: An average content of 9 percent nickel, average 18 percent of chromium, carbon content * 10 percent (0.1 percent).
1.The first figure before the grade mark is ten times the percentage of carbon content.
2. The figure behind the key element indicates the percentage of this element. If the element content is less than 1.5 percent, then the figure is not written, if more than 1.5 while less than 2.5 percent, then the figure 2 is written after the element.
3. The trace elements such as Ti, Nb, Al, N, and other trace elements should be written in the steel grades.
4. The character Y should be added in front of the mark for free cutting steel.
5. The trademark followed by "L" indicates cold drawing, plus "Q" indicates light drawing, plus "R" indicates the soft state.
Some specific international stainless steel wire standards:
U.S. Stainless Steel Wire Standards
The United States has the most varieties of stainless steel wire in the world, it has six ASTM standards, ferrite, martensite in nearly 100 different brands.
ASTM A580N-95a: stainless steel wire
ASTM A313M-95: stainless steel spring
ASTM A478-95a: chromium - nickel stainless steel weaving wire
ASTM A493-95: heat-resistant stainless steel wire and rod
ASTM A492-95: stainless steel wire rope
ASTM A581-95b: cutting stainless steel wire and rod
AWS A5.22-82: chrome and chrome-nickel steel
AWS A5.4-84: chrome and chrome-nickel steel, corrosion resistance electrode
China Taiwan Province stainless steel wire standards:
CNS G3067-86: For stainless steel rods
CNS G3199-88: for heat-resistant steel bar
CNS G3077-86: for stainless steel wire rod
CNS G3076-86: for stainless steel wire
CNS G3189-87: for cold stainless steel wire
CNS G3190-88: for welding stainless steel wire
CNS G3161-86: for spring with stainless steel wire
Japanese stainless steel wire standards
JIS G4303-98: for stainless steel rods
JIS G4311-91: for heat-resistant steel bar
JIS G4309-94: for stainless steel wire
JIS G4314-94: for spring with stainless steel wire
JIS G4315-94: for cold stainless steel wire
JIS T6103-94: dental stainless steel wire
JIS Z3321-89: stainless steel welding electrodes
JIS Z3321-85: stainless steel welding rod and wire
JIS Z3324-88: stainless steel welding rod and Flux
Stainless steel wire standards in Other countries and organizations:
DIN 17224-84 (Germany)
BS 1554-1990 (UK)
P-Г 0CT18143-72 (the former Soviet Union)
NF A35-577-90 (France)
UNI 6901-71 (Italy)
KS D3703-1992 (South Korea)
SS 142332 (1991) (Sweden)
NS 14480 (84) (Norway)
IS 6528-72 (India)
CSA G110.3 (Canada)
EN 151 (1986) (EU)
ISO 6931-1-1994 (ISO)
China's current standard of stainless steel wire:
GB/T4240-93 stainless steel wire standard
GB/T4240-93 Standard is for the classification of stainless steel wire, brands, size, shape, technical requirements, testing methods, inspection rules, packaging, labelling and quality certificates. This standard applies to stainless steel wire, but does not apply to spring, cold treatment with stainless steel wire and welding.
Commonly used marks in China with comparisons:
301:1Cr17Ni7: for spring
302:1Cr18Ni9: for spring
302HQ: 0Cr18Ni9Cu3: for cold heading with good performance
303: Y1Cr18Ni9 for precision shaft
304: 0Cr18Ni9: general steel
304M: 0Cr18Ni9, Ni 9.0% -10.0%: for rivets
304H: 0Cr18Ni9: C 0.05% -0.08%: high strength
304N: 0Cr18Ni9N: increased strength
304HC: 0Cr18Ni9Cu2: lower magnetic and improved corrosion resistance, for rivet
304L: 00Cr18Ni10
305: 1Cr18Ni12: non-magnetic
308: 0Cr21Ni12: for welding
309: 0Cr24Ni13: for welding
310: 0Cr25Ni20: Heat and corrosion-resistant, stable at temperature 1100 ℃
314: 0Cr25Ni20Si2: heat and corrosion-resistant, stable at temperature 1150 ℃
316: 0Cr17Ni12Mo2: plus Mo, anti-chloride corrosion
316L: 00Cr17Ni14Mo2: anti-corrosive hydrogen sulfide