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Conhecimento

Surface Finished and application

Surface Finished Description and Application
NO.1 Is produced by rolling stainless steel that has been heated prior to rolling (hot-rolling). This is followed by a heat treatment that produces a uniform microstructure (annealing) and ensures that the stainless steel will meet mechanical property requirements. After these processing steps, the surface has a dark non-uniform appearance called “scale”. Surface chromium has been lost during the previous processing steps, and, without removal of the scale, the stainless steel would not provide the expected level of corrosion resistance. Chemical removal of this scale is called pickling or descaling, and it is the final processing step. A No. 1 finish has rough, dull, and non-uniform appearance. There may be shiny spots were surface imperfections were removed by grinding. It is generally used in industrial applications, such as equipment for elevated temperature service. Used for:Air heaters, Annealing boxes, Boiler baffles, Carburizing boxes, Crystallizing pans, Firebox sheets, Furnace arch supports, Furnace conveyors, Furnace dampers, Furnace linings, Furnace stacks, Gas turbine parts, Heat exchanger baffles, Heat exchanger tubing supports, Incinerators, Industrial oven liners, Kiln liners, Oil burner parts, Recuperators, Refineries, Tube hangers。
NO.2E Cold rolled, heat treated, mechanically descaled. Rough and dull. Usually applied to steels with a scale which is very resistant to pickling solutions
NO.2D Is a uniform, dull silver gray finish that is applied to thinner coils whose thickness has been reduced by cold rolling. After rolling, the coil is heat treated to produce a uniform microstructure (annealing) and to meet mechanical property requirements. Pickling or descaling is necessary after heat treatment to remove the chromium depleted dark surface layer and restore corrosion resistance. Pickling can be the final step in production of this finish, but, when finish uniformity and/or flatness are important, there is a subsequent final light cold rolling pass (skin pass) through dull rolls. A No. 2D finish is preferred for deep drawing components because it retains lubricants well. It is used as a substrate when a painted finish is desired because it provides excellent paint adherence.
Used for:Automotive exhaust systems, Builder’s hardware, Chemical equipment, Chemical trays and pans, Electric range parts, Furnace parts, Petrochemical equipment, Rail car parts, Roof drainage systems, Roofing, Stone anchors
NO.2B Is a bright cold rolled finish commonly produced in the same manner as No. 2D, except that the final light cold rolling pass is done using polished rolls. This produces a more reflective finish that resembles a cloudy mirror. Finish reflectivity can vary from manufacturer-to-manufacturer and coil-to-coil with some coils looking quite mirror-like and others being fairly dull. No. 2B is a general purpose cold rolled finish commonly used for all but exceptionally difficult deep drawing applications. It is more readily polished to high luster than a No. 1 or No. 2D finish.
Used for:Bakeware, Chemical plant equipment, Dye house equipment, Flatware, Laundry and dry cleaning, Paper mill equipment, Pharmaceutical equipment
Plumbing fixtures, Refrigeration, Sewage treatment, Sheet metal products, Small tanks, Solar collector panels, Vacuum drum dryers, Waste fuel pool liners, Wheel covers
NO.3 Is characterized by short, relatively coarse, parallel polishing lines, which extend uniformly along the length of the coil. It is obtained by either mechanically polishing with gradually finer abrasives or by passing the coil through special rolls, which press a pattern into the surface that simulates the appearance of mechanical abrasion. It is a moderately reflective finish. When mechanically polishing, 50 or 80 grit abrasives are typically used initially and the final finish is typically achieved with 100 or 120 grit abrasives. The surface roughness is typically Ra 40 micro-inches or less. If a fabricator needs to blend in welds or do other refinishing, the resulting polishing lines are usually longer than on product polished by a producer or toll-polishing house.
Used for:Brewery equipment, Food processing equipment, Kitchen equipment, Scientific apparatus
NO.4 Is characterized by short, parallel polishing lines, which extend uniformly along the length of the coil. It is obtained by mechanically polishing a No. 3 finish with gradually finer abrasives. Depending on the requirements of the application, the final finish can be anywhere between 120 and 320 grit. Higher grit numbers produce finer polishing lines and more reflective finishes. The surface roughness is typically Ra 25 micro-inches or less. This general-purpose finish is widely used for restaurant and kitchen equipment, storefronts and food processing and dairy equipment. If a fabricator needs to blend in welds or do other refinishing, the resulting polishing lines are usually longer than on product polished by a producer or toll-polishing house.
Used for:Appliances, Architectural wall panels, Beverage equipment, Boat fittings, Bus shelters, Clean rooms, Column covers, Dairy equipment, Elevator doors and interiors, Escalator trim, Food processing equipment, Furniture
Highway tank trailers, Hospital surfaces and equipment, Instrument or control panels, Kitchen equipment, Luggage handling equipment, Mass transit equipment, Restaurant equipment, Sinks, Sterilizers, Storefronts, Water fountains
HL The products achieved by continuous grinding of No.2D surface with polishing abrasive belt with appropriate grain size. They have relatively long continuous grinding stripe (further divided into No.150~320), and are mainly used in building decoration and elevator decoration, etc.
BA Is produced by heat-treating (annealing) in a controlled atmosphere furnace. It has a mirror like appearance but may have some cloudiness and other imperfections. A finish that is designated “BA” has only been bright annealed. A finish that is designated “2BA” has been bright annealed and then passed between highly polished rolls. A minimal amount of roll pressure (skin pass) is applied. The process improves flatness and finish uniformity but does not significantly decrease thickness. Bright annealed stainless is sometimes buffed to attain a more mirror-like finish. It is often specified for applications where a highly reflective surface is desired.
Used for:Appliance trim, Appliances, Architectural components, Auto trim, Builder’s hardware, Chute liners, Commercial refrigerators, Cookware, Fishing equipment, Flatware, Food processing equipment, General hardware, Highway truck trailers, Mass transit cars, Radiant heaters, Range hoods, Scientific apparatus, Surgical instruments, Textile finishing equipment

Chemical Composition of JIS Specification

Specification Steel Grade C%
Max.
Si%
Max.
Mn%
Max.
P%
Max.
S%
Max.
Cr% Ni% Mo% Ti% Other
JIS SUS301
0.15
1
2
0.045
0.03
16.00-18.00
6.00-8.00
 
 
 
  SUS302
0.15
1
2
0.045
0.03
17.00-19.00
8.00-10.00
 
 
 
G4303 SUS304
0.08
1
2
0.045
0.03
18.00-20.00
8.00-10.50
 
 
 
  SUS304L
0.03
1
2
0.045
0.03
18.00-20.00
9.00-13.00
 
 
 
G4304 SUS304J3
0.08
1
2
0.045
0.03
17.00-19.00
8.00-10.50
 
 
Cu:1.00-3.00
  SUH309
0.2
1
2
0.045
0.03
22.00-24.00
12.00-15.00
 
 
 
G4305 SUS309S
0.08
1
2
0.045
0.03
22.00-24.00
12.00-15.00
 
 
 
  SUH310
0.25
1.5
2
0.045
0.03
24.00-26.00
19.00-22.00
 
 
 
G4312 SUS310S
0.08
1.5
2
0.045
0.03
24.00-26.00
19.00-22.00
 
 
 
  SUS316
0.08
1
2
0.045
0.03
16.00-18.00
10.00-14.00
2.00-3.00
 
 
  SUS316L
0.03
1
2
0.045
0.03
16.00-18.00
12.00-15.00
2.00-3.00
 
 
  SUS317
0.08
1
2
0.045
0.03
18.00-20.00
11.00-15.00
3.00-4.00
 
 
  SUS321
0.08
1
2
0.045
0.03
17.00-19.00
9.00-13.00
 
5*C Min.
 
  SUS347
0.08
1
2
0.045
0.03
17.00-19.00
9.00-13.00
 
 
Nb:10*C Min.
  SUSXM7
0.08
1
2
0.045
0.03
17.00-19.00
8.50-10.50
 
 
Cu:3.00-4.00
  SUH409
0.08
1
1
0.04
0.03
10.50-11.75
 
 
6*C to 0.75
 
  SUH409L
0.03
1
1
0.04
0.03
10.50-11.75
 
 
6*C to 0.75
 
  SUS410
0.15
1
1
0.04
0.03
11.50-13.50
 
 
 
 
  SUS420J1
0.16-0.25
1
1
0.04
0.03
12.00-14.00
 
 
 
 
  SUS420J2
0.26-0.40
1
1
0.04
0.03
12.00-14.00
 
 
 
 
  SUS430
0.12
0.75
1
0.04
0.03
16.00-18.00
 
 
 
 
  SUS434
0.12
1
1
0.04
0.03
16.00-18.00
0.75-1.25
 
 
 

Chemical Composition of ASTM Specification

Specification Steel Grade C% Si% Mn% P% S% Cr% Ni% Mo% Ti% Other
ASTM S30100 0.15 1 2 0.045 0.03 16.00-18.00 6.00-8.00     N:0.10 Max
A240 S30200 0.15 0.75 2 0.045 0.03 17.00-19.00 8.00-10.00     N:0.10 Max
  S30400 0.08 0.75 2 0.045 0.03 18.00-20.00 8.00-10.5     N:0.10 Max
  S30403 0.03 0.75 2 0.045 0.03 18.00-20.00 8.00-12.00      
  S30908 0.08 0.75 2 0.045 0.03 22.00-24.00 12.00-15.00      
  S31600 0.08 0.75 2 0.045 0.03 16.00-18.00 10.00-14.00 2.00-3.00   N:0.10 Max
  S31603 0.03 0.75 2 0.045 0.03 16.00-18.00 10.00-14.00 2.00-3.00   N:0.10 Max
  S31700 0.08 0.75 2 0.045 0.03 18.00-20.00 11.00-15.00 3.00-4.00   N:0.10 Max
  S32100 0.08 0.75 2 0.045 0.03 17.00-19.00 9.00-12.00   5*(C+N)Min.0.70 Max N:0.10 Max
  S34700 0.08 0.75 2 0.045 0.03 17.00-19.00 9.00-13.00     Cb:10*CM in.
                      1.00 Max.
  S40910 0.03 1 1 0.045 0.03 10.50-11.70 0.5Max     Ti:6*CMin.
                      0.5 Max.
  S41000 0.15 1 1 0.04 0.03 11.50-13.50 0.75Max      
  S43000 0.12 1 1 0.04 0.03 16.00-18.00 0.75Max      

Countries standard comparison table

Japan USA China Russia Belgium Germany France ISO
JIS
ASTM
GB
GOST 5632-72
BS970Part1
BSEN10088-1-95
DIN17400-96
DINEN10088-1-95
NFA35-578-91 
NFEN10088-1-95
683/13-86
TR4956/84
SUS201 201 1Cr17Mn6Ni5N - X12CrMnNiN X12CrMnNiN X12CrMnNiN 17-7-5 A-2
SUS202 202 1Cr18Mn8Ni5N 12KH17G9AH4 X12CrMnNiN X12CrMnNiN X12CrMnNiN 18-9-5 A-3
SUS301 301 1Cr17Ni7 - BS970Part1-96 301S21 - NFA35-574-95 Z12CN17.07 14
SUS302 302 1Cr18Ni9 12KH18H9 302S31 DIN17440-96 X12CrNi18-9 Z10CN18.09 12
SUS303 303 Y1Cr18Ni9 - 303S31 X12CrNiS18-9 Z10CNF18.09 17
SUS303Se 303Se Y1Cr18Ni9Se 12KH18H10E 303S42 - - 17a
SUS304 304 0Cr18Ni9 08KH18H10 304S31 X5CrNi18-10 Z7CN18.09 11
SUS304L 304L 00Cr19Ni11 03KH18H11 304S11 X2CrNi19-11 X2CrNi19-11 10
SUS304N1 304N 0Cr19Ni9N - - - - -
SUS304N2 XM21 0Cr19Ni10NbN - - - - -
SUS304LN - 00Cr18Ni10N - X2CrNiN18-10 X2CrNiN18-10 X2CrNiN18-10 10N
SUS305 305 1Cr18Ni12 12KH18H12T X4CrNi18-12 X4CrNi18-12 X4CrNI18-12 13
SUS309S 309S 0Cr23Ni13 - - - NFA35-578-91 Z15CN23-13 15
SUS310S 310S 0Cr25Ni20 - 310S31 - Z8CN25-20 16
SUS316 316 0Cr17Ni12Mo2 08KH17H13M2T 316S31 X5CrNiMo17-12-2 Z7CND17-12-2 20
20a
SUS316Ti 316Ti S31635 0Cr18Ni12Mo2Ti 08KH17H13M2T 320S31 X6CrNiMoTi17-12-2 X6CrNiMoTi17-12-2 21
SUS316L 316L 00Cr17Ni14Mo2 03KH17H14M2 316S13 X2CrNiMo18-14-3 X2CrNiMo17-12-2 19
19a
SUS316N 316N 0Cr17Ni12Mo2N - X5CrNiMo17-12-2 X5CrNiMo17-12-2 X5CrNiMo17-12-2 -
SUS316LN 316LN 00Cr17Ni13Mo2N - X2CrNiMo17-11-2 X2CrNiMoN17-11-2 X2CrNiMo17-11-2 19N
19aN
SUS316J1 - 0Cr18Ni12Mo2Cu2 - - - - -
SUS316JIL - 00Cr18Ni14Mo2Cu2 - - - - -
SUS317 317 0Cr19Ni13Mo3 08KH17H15M3T 316S33 X5CrNiMo17-13-3 - -
SUS317L 317L 00Cr19Ni13Mo3 03KH16H15M3 Part-4 317S12 X2CrNiMo18-15-4 X2CrNiMo18-15-4 24
SUS317J1 - 0Cr18Ni16Mo5 - - - - -
- 321 1Cr18Ni9Ti 12KH18H10T 321S31 X6CrNitI18-10 X6CrNiTi18-10 11
SUS321 321 0Cr18Ni10Ti 08KH18H10T 321S31 X6CrNiTi18-10 X6CrNiTi18-10 15
SUS347 347 0Cr18Ni11Nb 08KH18H12B 347S31 X6CrNiNb18-10 X6CrNiNb18-10 16
SUSXM7 XM7 0Cr18Ni9Cu3   X3CrNiCu18-9-4 X3CrNiCu18-9-4 X3CrNiCu18-9-4 -
SUSXM15J1 XM15 0Cr18Ni13Si4 - - - - -
SUS329J1 - 0Cr26Ni5Mo2 - - - - -
- - 1Cr18Ni11Si4AlTi 15KH18H12
G4TYU
- - - -
SUS405 405 0Cr13Al - 405S31 X6CrAl13 X6CrAl13 5
SUS410L - 00Cr12 - - - Z3CT12 -
SUS430 430 1Cr17 12KH17 430S17 X6Cr17 X6Cr17 8
SUS430F - YCr17   - X6CrMoS17 - 8a
SUS434 - 1Cr17Mo   X6CrMo17-1 X6CrMo17-1 X6CrMo17-1 9c
SUS447J1 - 00Cr30Mo2   - - - -
SUSXM27 XM27 00Cr27Mo   - - - -
SUS403 403 1Cr12   410S21 X6Cr13 X6Cr13 3
SUS410 410 1Cr13 12KH13 410S21 X12Cr13 - 3
SUS405 405 0Cr13Ae   403S17 X6Cr13 X6Cr13 1
SUS416 - Y1Cr13   416S21 - X12CrS13 7
SUS410J1 - 1Cr13Mo   - - - X12CrM126
SUS420J1 420 2Cr13 20KH13 420S37 X20Cr13 X20Cr13 4
SUS420J2 420 3Cr13 30KH13 420S37 X30Cr13 X30Cr13 5
SUS420F - Y3Cr13   - - - -
- - 4Cr13 40KH13 X46Cr13 X46Cr13 X46Cr13 -
SUS431 431 1Cr17Ni2 14KH17H2 431S29 X17CrNi16-2 X17CrNi16-2 96
SUS440A - 7Cr17   - - - -
SUS440B - 8Cr17   - - - -
SUS440C - 9Cr17 95KH18 - - - -
SUS440C - 11Cr17   - - - -
SUS440F - Y11Cr17   - - - -
SUS440C 440C 9Cr18Mo   - - - -
- - 9Cr18MoV   X90CrMoV18 X90CrMoV18 X90CrMoV18 -
SUS630 ASTM A564M-95 S17400 0Cr17Ni4Cu4Nb   ASTM A564M-95 S17400 - - ISO683/16-76
1
SUS631 17700 0Cr17Ni7Al 09KH17H7YU X7CrNiAL17-7 X7CrNiAl17-7 X7CrNiAl17  
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