Stainless steel related practical knowledge
First, stainless steel hot rolling steel plate
The stainless steel hot rolling steel plate is the stainless steel steel plate which produces with the hot rolling craft. What thickness is not bigger than 3mm is the thin steel plate, what thickness is bigger than 3mm is the thick plate. Uses in profession manufacture anticorrosion components, the vessel and the equipment and so on chemical industry, petroleum, machinery, ships. Its classification and the trademark are as follows:
1. austenite section
(1)1Cr17Mn6Ni15N; (2)1Cr18Mn8Ni5N; (3)1Cr18Ni9; (4)1Cr18Ni9Si3; (5)0Cr18Ni9; (6)00Cr19Ni10; (7)0Cr19Ni9N; (8)0Cr19Ni10NbN; (9)00Cr18Ni10N; (10)1Cr18Ni12; (11) 0Cr23Ni13; (12)0Cr25Ni20; (13) 0Cr17Ni12Mo2; (14) 00Cr17Ni14Mo2; (15) 0Cr17Ni12Mo2N; (16) 00Cr17Ni13Mo2N; (17) 1Cr18Ni12Mo2Ti; (18) 0Cr18Ni12Mo2Ti; (19) 1Cr18Ni12Mo3Ti; (20) 0Cr18Ni12Mo3Ti; (21) 0Cr18Ni12Mo2Cu2; (22) 00Cr18Ni14Mo2Cu2; (23) 0Cr19Ni13Mo3; (24) 00Cr19Ni13Mo3; (25) 0Cr18Ni16Mo5; (26) 1Cr18Ni9Ti; (27) 0Cr18Ni10Ti; (28) 0Cr18Ni11Nb; (29) 0Cr18Ni13Si4
2. austenite - - ferrite section
(30) 0Cr26Ni5Mo2; (31) 00Cr18Ni5Mo3Si2;
3. ferrite section
(32) 0Cr13Al; (33) 00Cr12; (34)1Cr15; (35)1Cr17; (36)1Cr17Mo; (37)00Cr17Mo; (38)00Cr18Mo2; (39)00Cr30Mo2; (40)00Cr27Mo
4. martensite section
(41) 1Cr12; (42) 0Cr13; (43); 1Cr13; (44) 2Cr13; (45) 3Cr13; (46) 4Cr13; (47) 3Cr16; (48) 7Cr17
5. precipitation hardening section
(49) 0Cr17Ni7Al
Second, stainless steel cold rolling steel plate
The stainless steel cold rolling steel plate is with the cold rolling craft production stainless steel steel plate, what thickness is not bigger than 3mm is the thin steel plate, what thickness is bigger than 3mm is the thick plate. Uses in manufacturing the anti-corrosive part, the petroleum, the chemical pipeline, the vessel, the medical instrument, the shipboard equipment and so on, its classification and the trademark are as follows:
1. austenite section
Besides with hot rolling part same (29 kinds), but also has: (1) 2Cr13Mn9Ni4(2)1Cr17Ni7(3) 1Cr17Ni8
2. austenite - - ferrite section
Besides with hot rolling part same (2 kinds), but also has: (1)1Cr18Ni11Si4AlTi(2) 1Cr21Ni5Ti
3. ferrite section
Besides with hot rolling part same (9 kinds), but also has: 00Cr17]
4. martensite section
Besides with hot rolling part same (8 kinds), but also has 1Cr17Ni2
5. precipitation hardening section: With hot rolling part
Third, ferrite, austenite, martensite synopsis
Everybody knew that the solid state metal and the alloy are crystals, namely in its internal atom is according to certain rule arrangement, the arrangement way has three kinds generally namely: Space-centered cubic lattice structure, face-centered cubic lattice structure harmonious platoon hexagonal pattern structure. The metal is composed of the polycrystal, its polycrystal structure is forms in the metallic crystal process. The composition iron-carbum alloy's iron has two kind of lattice structures: 910℃ below to have the space-centered cubic lattice structure Alpha - the iron, 910℃ above to have the face-centered cubic lattice structure UPSILON - the iron. If the carbon atom pushes to the hard crystal lattice, and not the broken low-quality iron has the lattice structure, such material is called the solid solution. The carbon dissolves the solid solution which forms to Alpha - the iron to call the ferrite, it dissolves the carbon ability to be extremely low, the greatest solubility does not surpass 0.02%. But the carbon dissolves the solid solution which forms to UPSILON - the iron to call the austenite, it dissolves the carbon ability to be high, highest may reach 2%. The austenite is the iron-carbum alloy high temperature.
Steel when high temperature forms austenite, underheating to 727℃ below when turns the unstable underheating austenite. If by the enormous cooling rate underheating to 230℃ below, in the austenite carbon atom non-proliferation's possibility, the austenite will transform one kind directly by now including the carbon oversaturation Alpha the solid solution, is called the martensite. As a result of the carbon amount oversaturation, causes the martensite intensity and degree of hardness enhances, the plasticity to reduce, brittleness increases.
Stainless steel corrosion resistance important source in chromium. The experiment proved that when the chromic quantity surpasses 12% the steel anticorrosion performance greatly will only then enhance, therefore, in the stainless steel chromic quantity will not be generally lower than 12%. As a result of the chromic quantity's enhancement, also has the very tremendous influence to the steel organization, when the chromium content is high, but the carbon content very youth, the chromium can cause the hard carbon balance, on the chart UPSILON the area reduces, even vanishes, this kind of stainless steel for ferrite organizational structure, when heating does not occur changes, is called the ferrite stainless steel.
When the chromic quantity is low (, but is higher than 12%), the carbon content is high, alloy when from high-temperature cooling, extremely easy to form the martensite, thus is called this kind of steel for the martensite stainless steel.
The nickel may expand UPSILON the area, enables the steel products to have the austenite organization. If the nickel content are many enough, enables the steel also to have the austenite organizational structure under the room temperature, then calls this kind of steel the austenite stainless steel.

Fourth, our country and Japanese commonly used stainless steel steel grade approximate comparison
1. comparative table:
Japan (JIS) China (GB)
SUS304 0Cr18Ni9(0Cr19Ni9)
SUS 304L 00Cr19Ni10(00Cr18Ni10)
SUS 309S 0Cr23Ni13
SUS 310S 0Cr25Ni20(1Cr25Ni20Si2)
SUS 316 0Cr17Ni12Mo2(0Cr18Ni12Mo2Ti)
SUS 316L 00Cr17Ni14Mo2
SUS 321 1Cr18Ni9Ti(0Cr18Ni9Ti)
SUS 430 1Cr17
SUS 403 1Cr12
SUS 410 1Cr13
SUS 420J1 2Cr13
SUS 420J2 3Cr13
SUS 431 1Cr17Ni2
2. after the trademark, duo NO.1 expressed after hot rolling, carries on the heat treatment, the acid pickling or similar processing; NO.2 expressed after the cold rolling, carries on the heat treatment, the acid pickling or corresponding processing; NO.2B expressed after the cold rolling, carries on the heat treatment, the acid pickling or similar processing, finally passes through the cold rolling to obtain the suitable smooth finish. If the 304NO.1 stainless steel plate expressed that the trademark is 304 hot rolling stainless steel plates. Moreover 321-2B expressed the trademark is 321 cold rolling stainless steel plate, after the superficial request cold rolling, carries on the heat treatment, the acid pickling or similar processing, finally passes through the cold rolling to obtain the suitable smooth finish.
Stainless steel trademark and American, Japanese, European comparative table
Category China US Japan Europe
Martensitic stainless steel Cr13 410SUS410SAF2301
1Cr17Ni2431SUS431SAF2321
9Cr18440CSUS440c　
0Cr17Ni4Cu4Nb17-4PHSUH630　
1Cr12Ni3MoWVXM32 DIN1.4313
2Cr12MoVNbN SUH600　
2Cr12NiMoWV SUH616　
Double-phase steel 　　　　00Cr18Ni5Mo3Si2S315003RE60　
00Cr22Ni5Mo3NS31803329J3L1SAF2205
00Cr25Ni6Mo2N 329J1L1R-4　
00Cr25Ni7Mo3NS31260329J4LSAF2507
00Cr25Ni6Mo3CuN S32550 　 　
Ferrite 0Cr13410SSUS410S　
00Cr17Ti　 　 　
00Cr18Mo2Ti　 　 　
Austenite stainless steel 0Cr18Ni9Ti321SUS321SAF2337
00Cr19Ni10304LSUS304L　
0Cr17Ni12Mo2316SUS316SAF2343
0Cr17Ni14Mo2316LSUS312L　
00Cr19Ni13Mo3317LSUS317L　
ZG00Cr19Ni10CF3SCS19A　
ZG00Cr17Ni14Mo2CF3MSCS16A　
0Cr25Ni20310SSUS310S　
00Cr20Ni18Mo6CuNS31254 254SMO
00Cr20Ni25Mo4.5Cu904L 2RK65
00Cr25Ni22MoNS31050 2RE6