Code surface processing type
No.2E rolled (with scale) after heat treatment, pickling (plus or mechanical descaling acid) treatment process
No.2D After cold rolling, heat treatment is performed, pickling treatment process
No.2B After cold rolling, heat treatment is performed after pickling, and then leveling process
After No.3 cold rolling, heat treatment, after pickling, then 80 # to 120 # abrasive belt grinding, leveling processing
No.4 after cold rolling, heat treatment, after pickling, then 150 # to 320 # abrasive belt grinding, leveling processing
HL after cold rolling, heat treatment, after pickling, then 150 # to 320 # abrasive belt grinding and polishing, smooth processing
 

4 Ordering information required
Users must provide the following information when ordering 4.1:
a) Product Name (steel or steel);
b) The product standards;
c) grades;
d) product specifications and dimensions, flatness accuracy;
e) the edge of the state;
f) surface processing type;
g) the weight or quantity;
h) other special requirements.
4.2 If the contract does not specify the size of the order and precision flatness, margin status, packaging, places the size of ordinary accuracy, roughness of ordinary precision, without trimming state delivery, according to the supplier to provide the packaging packaging.

5 size, shape, weight and tolerances
Steel sheet and strip size, shape, weight and tolerances shall comply with Q / BQB 4401's

6 Technical Requirements
6.1 Chemical Composition
6.1.1 austenitic stainless steel grades and chemical composition (heat analysis) should meet the requirements of Table 3.
6.1.2 Designation and chemical composition of ferritic stainless steel (melting analysis) shall comply with the provisions of Table 4.
6.1.3 martensitic stainless steel grades and chemical composition (heat analysis) should meet the requirements of Table 5.
6.1.4 finished steel sheet and strip chemical composition tolerances shall comply with the provisions of GB / T222's.
Table 3

Brand No. Chemical composition a (wt)%
C Si Mn P S Ni Cr Mo Cu N Other elements
SUS304 0.08 1.00 2.00 0.045 0.030 8.00 ~ 10.50 18.00 ~ 20.00 - - - -
SUS304Cu 0.08 1.00 2.00 0.045 0.030 8.00 ~ 10.50 18.00 ~ 20.00 -. 0.70 ~ 1 30 - -
SUS304L 0.030 1.00 2.00 0.045 0.030 9.00 ~ 13.00 18.00 ~ 20.00 - - - -
SUS316 0.08 1.00 2.00 0.045 0.030 10.00 ~ 14.00 16.00 ~ 18.00 2.00 ~ 3.00 - - -
SUS316L 0.030 1.00 2.00 0.045 0.030 12.00 ~ 15.00 16.00 ~ 18.00 2.00 ~ 3.00 - - -
SUS321 0.08 1.00 2.00 0.045 0.030 9.00 ~ 13.00 17.00 ~ 19.00 - - - Ti≥5 × C
In addition to the ingredients listed in a table indicate the range, the rest are maximum.
 

Table 4

Brand No. Chemical composition a (wt)%
C Si Mn P S Nib Cr N Other
SUH409L 0.030 1.00 1.00 0.040 0.030 - 10.50 ~ 11.75 - Ti: 6 × C ~ 0.75
SUS430 0.12 0.75 1.00 0.040 0.030 - 16.00 ~ 18.00 - -
SUS410L 0.030 1.00 1.00 0.040 0.030 - 11.00 ~ 13.50 - -
In addition to the ingredients listed in a table indicate the range, the rest are maximum.
b may contain Ni≤0.60%.
 

Table 5

Brand No. Chemical composition a (mass fraction),%
C Si Mn P S Nib Cr
SUS410 0.15 1.00 1.00 0.040 0.030 - 11.50 ~ 13.50
SUS410S 0.08 1.00 1.00 0.040 0.030 - 11.50 ~ 13.50
SUS420J1 0.16 ~ 0.25 1.00 1.00 0.040 0.030 - 12.00 ~ 14.00
In addition to the ingredients listed in a table indicate the range, the rest are maximum.
b may contain Ni≤0.60%.
 

6.2 smelting method
Steel sheet and strip steel used in electric furnace smelting plus AOD and VOD (or LF or LTS) refining method of smelting.
6.3 Delivery status
After the cold-rolled steel sheet and strip to and after heat treatment and descaling (pickling or mechanical descaling descaling acid descaling plus) treatment delivery.
6.4 Mechanical Properties
6.4.1 Mechanical properties of various types of heat-treated steel sheet and strip shall conform to the provisions of Article 6.4.2 - 6.4.4. Which usually yield strength values ​​as reported, for parties sought assurances that the yield strength values ​​should be discussed in order, and indicate in the contract. For several hardness test, the supplier usually only provide hardness value according to a hardness test methods, for 6 to table a certain hardness test methods 8 party asked to select the table, should be negotiated at the time of ordering, and note in the contract Ming, otherwise hardness test method chosen by the supplier. When the bending test, the outer surface of the specimen after bending shall not have visible cracks, as the supplier can guarantee, without bending test.
6.4.2 Mechanical properties of stainless steel after solution treatment austenite should comply with Table 6.
6.4.3 After ferrite mechanical properties of annealed stainless steel shall conform to Table 7.
6.4.4 by the mechanical properties of annealed martensitic stainless steel shall conform to Table 8.
Table 6

Tensile test card numbers a, b ​​hardness test
Yield strength Rp0.2
MPa
Tensile strength not less than
Rm
MPa
Not less than Elongation
A
%
Not less than HBW
Not more than HRB
Not more than HV
Not more than
SUS304 205 520 40 187 90 200
SUS304Cu 205 520
SUS304L 175 480
SUS316 205 520
SUS316L 175 480
SUS321 205 520
a tensile test specimens specified value applies to the lateral, lateral bending test sample taken;
b steel sheet and strip nominal thickness of less than 3mm, tensile specimens taken L0 = 50mm, b = 12.5mm, namely GB / T 228 in P5 sample; steel sheet and strip nominal thickness of not less than 3mm, the tensile specimens take L0 = 50mm, b = 25mm, i.e. GB / T 228 in the sample P14.
 

Table 7

Grade Tensile test a, b ​​hardness test a 180 ° bending test
(b≥20mm)
Yield Strength
Rp0.2
MPa tensile strength
Rm
MPa Elongation
A
% HBW HRB HV d- bent core diameter
a- plate thickness
SUH409L ≥175 ≥360 ≥25 ≤162 ≤80 ≤175 a <8mm, d = 1a
a≥8mm, d = 2a
SUS430 ≥205 ≥420 ≥22 ≤183 ≤88 ≤200 d = 2a
SUS410L ≥195 ≥360 ≥22 ≤183 ≤88 ≤200
a tensile test specified value applies to the longitudinal sample;
b steel sheet and strip nominal thickness of less than 3mm, tensile specimens taken L0 = 50mm, b = 12.5mm, namely GB / T 228 in P5 sample; steel sheet and strip nominal thickness of not less than 3mm, the tensile specimens take L0 = 50mm, b = 25mm, i.e. GB / T 228 in the sample P14.
 

Table 8

Grade Tensile test a, b ​​hardness test a 180 ° bending test
(b≥20mm)
d- bend core diameter
a- plate thickness
Yield Strength
Rp0.2
MPa tensile strength
Rm
MPa Elongation
A
% HBW HRB HV
SUS410 ≥205 ≥440 ≥20 ≤201 ≤93 ≤210 d = 2a
SUS410S ≥205 ≥410 ≥20 ≤183 ≤88 ≤200
SUS420J1 ≥225 ≥520 ≥18 ≤223 ≤97 ≤234 -
a tensile test specimens specified values ​​apply to vertical, lateral bending test sample taken;
b steel sheet and strip nominal thickness of less than 3mm, tensile specimens taken L0 = 50mm, b = 12.5mm, namely GB / T 228 in P5 sample; steel sheet and strip nominal thickness of not less than 3mm, the tensile specimens take L0 = 50mm, b = 25mm, i.e. GB / T 228 in the sample P14.
 

6.5 corrosion
Negotiated by both parties and specified in the contract, may be intergranular corrosion test steel sheet and strip.
6.6 Surface Quality
6.6.1 shall not affect the steel sheet and strip surface defects using. Steel sheet and strip surface oxide and had not allowed pickling defects.
6.6.2 For steel, because there is no chance to cut with a defective part, therefore allowing the strip with defects delivery, but the length of the defective part may not exceed 6% of the total length of each volume.
6.7 Surface roughness
Surface processing type No.2E of steel sheet and strip, average surface roughness by Ra≤3.5μm control.
6.8 For a party to the chemical composition of steel sheet and strip, mechanical properties, non-metallic inclusions, high temperature performance and other special requirements, can be negotiated at the time of ordering, and indicate in the contract.

7 Inspection and testing
7.1 steel sheet and strip appearance with the naked eye inspection.
Size 7.2 steel sheet and strip, shape measurement tool application meets the accuracy requirements.
7.3 each batch of steel sheet and strip of test items, the number of samples, sampling methods, test methods and shall comply with the requirements in Table 9.
7.4 steel sheet and strip shall be approved for acceptance, each batch shall be not more than 30 tons of the same grade, the same type of surface finish, the same heat, the same size and the same heat treatment system consisting of steel sheet and strip.
Table 9

Test item number of samples (a) sampling methods Test methods
Chemical composition 1 / furnace GB / T 20066 GB / T 223, GB / T 11170, GB / T 14203, GB / T 20123, GB / T 20125
Tensile test 1 / batch GB / T 2975 GB / T 228
Hardness 1 / batch GB / T 230.1, GB / T 231.1, GB / T 4340.1
Bending test a / batch GB / T232
Surface roughness - GB / T 2523
 

7.5 If a particular test results do not meet the standard requirements, either from the same batch and then double the number of samples taken retest the failed project. Retest results (including all indicators required for the project test) qualified, then the whole batch qualified. Retest results (including all indicators required for the project test) even if there is an indication of failure, then retest failed. Reinspection as substandard, they have been doing tests and test results of a single piece of substandard not acceptance, but the batch of material without making a single piece by piece test may re-submit testing and acceptance.

8 packaging, marking and inspection documents
Steel sheet and strip packaging, marking and inspection documents shall comply with Q / BQB 4400's

9 numerical rounding methods should be consistent with the provisions of GB / T 8170's.

Appendix A
(Normative)
The basic weight of stainless steel
Table A.1 kg / (mm.m2)

Grades Grades basic weight basis weight
SUS304 7.93 SUH409L 7.75
SUS304Cu 7.93 SUS430 7.70
SUS304L 7.93 SUS410L 7.75
SUS316 7.98 SUS410 7.75
SUS316L 7.98 SUS410S 7.75
SUS321 7.93 SUS420J1 7.75
 

Appendix B
(Informative)
This standard is similar to the use of standards and related standards grades table
Table B.1

Q / BQB 4402-2009 GB / T
3280-2007 JIS G 4305: 2005
JIS G 4312: 1991 ASTM A240 / A240M-07 EN
10088-2: 2005
SUS304 06Cr19Ni10 SUS304 304 X5CrNi18-10 (1.4301)
SUS304Cu - SUS304Cu - -
SUS304L 022Cr19Ni10 SUS304L 304L X2CrNi19-11 (1.4306)
SUS316 06Cr17Ni12Mo2 SUS316 316 X5CrNiMo17-12-2 (1.4401)
SUS316L 022Cr17Ni12Mo2 SUS316L 316L X2CrNiMo17-12-2 (1.4404)
SUS321 06Cr18Ni11Ti SUS321 321 X6CrNiTi18-10 (1.4541)
SUH409L 022Cr11Ti SUH409L - X2CrTi12 (1.4512)
SUS430 10Cr17 SUS430 430 X6Cr17 (1.4016)
SUS410L 022Cr12 SUS410L - -
SUS410 12Cr13 SUS410 410 X12Cr13 (1.4006)
SUS410S 06Cr13 SUS410S 410S X6Cr13 (1.4000)
SUS420J1 20Cr13 SUS420J1 420 X20Cr13 (1.4021)