This standard applies to stainless steel hot-rolled equal-leg angle steel. GB/T 4227-1984 Stainless steel hot-rolled equal-leg angle steel GB/T4227-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hot rnlled stainless steel with equal leg angles
Hot rnlled stainless steel with equal leg angles This standard applies to hot rolled stainless steel with equal leg angles (hereinafter referred to as hot rolled steel). Categories and grades
Angle steel is divided into two categories according to its organizational characteristics, with a total of 8 grades: Category Grades are listed in accordance with the following table 1. 1 Category and grade
2 Dimensions, shape, and designation
iCriaNig
nCr19Nig
00Cr19Ni11
0Cr17Ni12M02
00Cr17Ni14Mm2
OCrNiTi
OCr18Ni11NL
2.1 The standard dimensions of angle steel shall be as specified in Table 2. 2.2 The allowable deviation of the size of angle steel shall be as specified in Table 3. 2.3 Angle steel length || tt || 2.3.1 The standard length of angle steel is 4.0m; 5.0m: 6.0m. Method: Try not to use this length when designing. 2.3.2 The allowable deviation of angle steel length is *4m. 2.4 The right angle of the angle steel is 90°+2
2.5 The allowable deviation of the curvature of the angle steel is stipulated as follows: the curvature of the whole length of the pipe is less than or equal to 4mm per cold pipe, and the curvature is 1mm×1mm per day (mi
National Bureau of Standards 1984-03-26 issued
UDC 669.14
.018.821
GB 4227—84
1985-03-01 implementation
4227---84
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20 ×20
25 ×25
30×30
40×40
50×50
60 × 60
65 × G5
70 × 70
75×75
80 ×80
9 ×90
100×100
Allowable deviation
GB4227-B4
Allowable deviation of size
Note: The minimum allowable deviation of size specified in the specification shall be determined by negotiation between the supplier and the buyer. 2.6 Weight
2.6.1 The weight of angle steel shall be calculated according to the theoretical weight and expressed in kg. The weight calculation method of angle steel shall be in accordance with Table 2.
Calculate the standard cross-sectional dimensions of angle steel according to the provisions of Table 2. The corresponding cross-sectional area and theoretical weight can be found in 1, 2.6. 3
Yanben Weight
kg/(cm* +m)
Cross-sectional area
Theoretical weight
Single root weight
GB 4227—B4
Table 1 Weight calculation method
Ren Shun method
Cross-sectional area 1 cm2 length 1 m weight
0.793 (1Cr18Nig, uCr19Nig, 00Cr19Ni11, oC.r18Ni11Ti?\. 79R (0Cr17Ni12 M02, 80Cr1?Ni11 M02. Cr1:Ni11 Nb) 0.770 (1C-17)
The following formula is used for evaluation: The result ×
1(2 A - t) + 0.215 (r - 2 3) Basic weight kg/(rmm) × Mountain product
Theoretical weight kg/m × K degree m
Weight of each bar kg × Total number of bars of the same size
Note: () The cross-sectional area calculation uses symbols to represent the cross-sectional dimensions of the angle steel. The relationship between the cross-sectional parts and the symbols is shown in the figure below. 2 The number of digits of the result
The effective number is
The effective number is
The effective number is
The integer value is
② The numerical processing method shall be carried out in accordance with the provisions of Appendix C of GB 1.L-81 "Standardization Guidelines for the Preparation of Standards-Age Regulations". 3 Technical requirements
3.F Chemical composition
8. 1.1 The chemical composition (melting analysis) of steel shall be in accordance with the provisions of Table 5 and Table 6. 3.1.2 When the finished product is analyzed (inspected by the purchaser or inspected by the supplier at the request of the purchaser), the allowable deviation value shall be in accordance with the provisions of Table 3 of GB222-84 "Steel Chemical Analysis Test Sample Sampling Method and Finished Product Chemical Composition Allowable Deviation". For the elements or chemical composition provisions that are not applicable in Table 3, the provisions of the agreement between the supply and demand parties shall be made. 3.2 Delivery state
3.2.1 The angle steel after hot rolling shall be heat treated according to Table 7 and Table 8, properly straightened, and then pickled or similarly treated. 3.2.1.1 With the consent of the purchaser, the angle steel may not be heat treated. 3.2.1.2 According to the requirements of the purchaser, the pickling process may also be omitted. 3. 3 Mechanical properties
The mechanical properties of heat-treated angle steels shall comply with the provisions of 3.3.1 to 3.3.2. However, the grinding strength of steel shall be measured only when required by the purchaser (specified in the contract). For the hardness test, the same method can be used according to the different sizes and states of the steel. 3.3.1 The mechanical properties of austenitic angle steels that have been scraped and dissolved shall comply with the provisions of Table 9. For austenitic angle steels that have not been dissolved, take a rough sample and perform solid solution treatment at an appropriate temperature within the temperature range specified in Table 7, and its mechanical properties shall comply with the provisions of Table 9. 3.3.2 The mechanical properties of ferritic angle steels that have been annealed shall comply with the provisions of Table 10. For ferritic angle steels that have not been annealed, take a rough sample and perform annealing treatment at an appropriate temperature within the temperature range specified in Table 8, and its mechanical properties shall comply with the provisions of Table 10. No.
CrigNig
nCri9Nig
3 00Cr19Ni11
pCr17 Ni12 M02 [,0.18
GE4227--84
Chemical composition of long-body stainless steel
2, nm
≤1. 00≤.2.00
21. 002.HF
0o Cr17Nit4 Mo2 : 0. 030 / c t. 00—2.
bCriBNilIT:
bCr18Ni1lNh
8.00-in.om 17.m~19.J | | tt | 16.0t - 18.00 |2.1m1 ~3. m0.035 .0.03012.06 --15.c0
16.00 -- 1R.00 2. ~- 3.00
.0.030
9.00~13.0017.01-19.00
9.00 ~13,00 /37. 06 - 19.00
11.002.000,1350.03
Table 6 Chemical composition of ferritic stainless steel
iCrigNis
UCrnNig
00Cr19N:11||tt| |0Cr17Ni12Mo?
n Cr 1? Ni14 M02
(CHANiIT
DCtiNi11Nb
Table 7 Heat treatment system of austenitic steel
Drama treatment| |tt||[010 ~11 fast cooling
1010～1150 fast cooling
1410-1150 fast cooling
1010 --1130
980-1150# cold
t6.00 -18.60
According to the user's requirements, the temperature is H5-30, and the temperature is transferred according to the user's requirements. Heat treatment, the temperature is 850~930℃ No.
GB4227-84
Table 8 Heat treatment system of ferritic steel
780 ~ 850Air cooling or slow cooling
Table 9 Mechanical properties of Austrian wire angle steel after solution treatment Tensile test
1CrjNig
DCr18Ni9
aCr19Ni1
0Cr17Ni12 M02
00Cr17Ni14Mo2
OCtiBNiliTi
0Cri8Ni1iNb
Yield strength
kgf/mm2
[N/mm2)
[ -206】
（206)
206）
(2h）
Tensile strength h
kgf/mm?
( N/mm2)
(2-valent)
(2520)
Hardness test
: : 87
Note: The materials listed in brackets in the table The single check and the number should be the international front price! 51) The unit and value are for illustration only. It also represents the North Korean people. In this way, IN/mn*= 1 MPa.
The body shape after the enlargement treatment can maintain the primary school energy 10
Pulling force Cheng Tu
Xifu strong change
kgf/mm
(N/mm)
Tensile strength
kgf:mm
(N/mn\:
1 45:
Degree of quality
8.4 Quality inspection
GB4227—84
3.4.1 Angle steel shall be quality inspected according to the methods specified in 3.4.1.1 to 3.1.1.6. Inter-corrosion test. The applicable inter-corrosion test method shall be determined by the supplier and the buyer through negotiation (specify in the contract). 10% oxalic acid etch test, the etched structure after the test (the structure that is not passed: judge according to Table 11). 3.4,1.1
Sulfuric acid-iron sulfate corrosion test. Applicable grades and their corrosion reduction should be derived from the table 12, 3.4.1.2
65% nitric acid corrosion test. Applicable grades and their corrosion reduction should comply with the provisions of Table 13. 3.4.1.3
Nitric acid-hydrofluoric acid corrosion test, applicable grades Its corrosion ratio should comply with the provisions of Table 14. Sulfuric acid and nitric acid copper corrosion test, the brand of suitable Sichuan and the state of the oil after the test should comply with the provisions of Table 15, Table 1110% oxalic acid test
uCr19Nig
0Cr17Ni12Mo2
0oCr19 Ni11
00Cr17 Ni14M02
oCrgNi Ti
CCr18Ni11Nb
oCr19Ni9
Test status
Delivery status
（Lake Joint)
Influence of the demon
Carboxylic acid
Iron corrosion test
Groove tissue
Tide-shaped knot||tt ||65 Wax acid
Magic test
Groove-shaped shrinkage
Ahuo tissue II
Separation tissue
River-shaped red weave||tt ||Table 2 Corrosion reduction test status of sulfuric acid-ferric sulfate corrosion test Product
Delivery requirements
Rate treatment:
0Cr17N:12M02
00Crl9Ni1l
00 Ct1-Ni11 Mo2
Chemical treatment
1365 Details of nitric acid corrosion test
oCt19Nig
0oCr1gNi11
Test status
Change status (weekly solution treatment
Digitalization Foreign Institute
Nitric Acid-Stripes
Acid Corrosion Test
Groove Weave
Groove Group!
Sulfuric Acid
Copper Demon Corrosion Test
Groove Group Hook
Hongqi Coarse
Key Reduction Station im-h)
Set for Happy Square Less Set
According to Supply and demand and implementation
corruption reduction &imh)
according to supply commitment and effect coordination
according to supply and demand double point agreement
GB 4227—84
Table 14 Corrosion ratio of nitric acid-hydrofluoric acid corrosion test Grade
OCe17Ni12Mo2
Do Cr 17 Ni14 Mo2
Pockmarking ratio||tt ||5 Bending surface condition after sulfuric acid-copper sulfate corrosion test Table 15
aCrigNig
0Cr E7Ni 12 M02
00Cr19Ni11
00 Cr 17 Ni 14 Mo2||tt ||oCriNilTi
oCrig Nil1 Nb
Test status
Delivery status
[Solution treatment]
Sensitization treatment
Bending surface status after test
Not allowed There are double lines of corrosion between grades
No corrosion cracks between grades
According to the requirements of the buyer (specified in the contract 1), the angle steel can be subjected to a 5% sulfuric acid brain corrosion test. Applicable grades and their Corrosion loss a. 4.2
shall comply with the requirements of Table 16.
Table 1 Corrosion reduction in 65% sulfuric acid corrosion test No.
0Cr 17 Ni 12 M02
00Cr17Ni14Mo2
Test status
Delivery status|| tt||《Solution treatment 1
Corrosion loss g/(m2 h)
3.5 Surface quality
The surface of the steel bar shall not have defects that are harmful to its use. When harmful defects occur, the steel can be removed by tools such as grinding wheels, but the cross-sectional size of the trimmed angle steel must be within the allowable deviation range, and the connection between the trimmed part surface and the original rolled surface should be smooth. 4 Test methods
4.1 General requirements for analytical tests shall be in accordance with GB1467-7R "General principles and general provisions for chemical analysis methods for metallurgical products", and the sample preparation for analytical tests shall be in accordance with GB222-84 "Standards for chemical analysis of steel". The sample separation shall be carried out in accordance with the following standards. GB223.1~223.6, GB223.8~223.24 in "Methods for Chemical Analysis of Iron, Steel and Alloys"--82:YB3512)- —78 "Determination of Molybdenum Content in Iron and Steel", YB35(13)—78 "Determination of Silver Content in Iron and Steel": YB35(22)—78 "Determination of Nitrogen Content in Iron and Steel GB422784
". The above standards do not specify The method is determined by both the supply and demand parties. 4.2 Experimentation
4.2.1 Mechanical specimens shall be collected in accordance with GB2975-82 "Steel Mechanical and Processing Properties Test Sampling Rules". 4.2.2 Tensile test shall be carried out in accordance with the following provisions. 4.2.2.1 The specimens shall be prepared in accordance with GB 228-76 "Metal Tensile Test Method" with L = 5.65VF, standard short specimens. 4.2.2.2 The test method shall be in accordance with GB 228-76. However, the test temperature shall be 20 + 5℃ as the standard. 4.2.3 Impact test shall be carried out in accordance with the following provisions.
4.2.3.1 The specimens shall be prepared in accordance with the U-shaped standard specimens specified in GB229-84 "Metal Normal Temperature Impact Toughness Test Method". 4.2.3.2 The test method shall be in accordance with GB 229-84. However, the test temperature shall be 20 ± 2℃ as the standard. 4.2.4 Hardness test shall be carried out in accordance with the following provisions. 4.2.4.1 The certification specimen shall be a part of the tensile specimen. 4.2.4.2 The test method shall be in accordance with the following standards, but the test temperature shall be 20±5℃. GB230--83 "Metallic Jake's Hardness Test Method"; GB231-84 "Metallic Cloth Hardness Test Method", GB4340-84 "Metallic Vickers Hardness Test Method".
5 Inspection Rules
5.1 Except for the following provisions, the general provisions for the acceptance of angle steel shall be in accordance with GB2101-80 "General Provisions for Acceptance, Packaging, Marking and Quantity Certification of Steel Shapes"
5.2 For mechanical tests and wrist corrosion tests, take one test material from the batch of the same brand, furnace number and heat treatment conditions, and take one of each kind of test sample from each test material. For chemical analysis test samples, take one from each brand and furnace number. 5.3 The test results of chemical analysis, mechanical properties, corrosion resistance, surface quality requirements, appearance and size shall all comply with the relevant provisions of this standard or the provisions of the supplementary agreement. However, if the purchaser agrees, part or all of the tensile test, impact test and hardness test can be omitted.
6 Marking and Certificate
Packaging, marking and quality certificate shall comply with the relevant provisions of GB2101-80. In addition, if alloying elements other than those in the table are added according to the provisions of the "Notes" in Tables 6 to 9, the maximum content of the alloying elements added shall be noted in the quality certificate.
Additional Notes:
This standard was proposed by the Ministry of Metallurgy of the People's Republic of China. This standard was drafted by the Standardization Research Institute of the Ministry of Steel and Metallurgical Industry. The main contributors to this standard are Dai Huazhou, Teng Shiling and Cai Lianfan.
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