JB/T 6398-1992 Large stainless, acid-resistant and heat-resistant steel forgings

This standard specifies the service characteristics, ordering, manufacturing and acceptance technical requirements for austenitic and martensitic stainless, acid-resistant and heat-resistant steel forgings. JB/T 6398-1992 Large stainless, acid-resistant, heat-resistant steel forgings JB/T6398-1992 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Large Stainless, Acid-Resistant, Heat-Resistant Steel Forgings
Subject Content and Scope of Application
JB/T 6398 - 92
This standard stipulates The usage characteristics, ordering, manufacturing and acceptance technical requirements of austenitic and martensitic stainless, acid-resistant and heat-resistant steel forgings are discussed. This standard applies to large-scale stainless, acid-resistant, and heat-resistant steel forgings for general purposes. Referenced standards
Methods for chemical analysis of steel and alloys
GB228 Metal tensile test method
GB 2291
Metal Summer Ratio (U-shaped notch) impact test method GB231
Metal Brinell hardness test method
3 Ordering requirements
3.1 The purchaser should specify the name, steel number, and Quantity and availability status. 3.2 The purchaser should provide ordering drawings and related finishing drawings. 3.3 When additional requirements are required, they should be agreed upon by both parties. 4 Manufacturing
4.1 The steel for forgings should be smelted by electric furnace or ladle refining furnace. 4.2 The nozzle and riser of each steel ingot should have enough removal to ensure that the forgings have no shrinkage holes and severe segregation. 4.3 Forgings should be forged and formed on a forging press with sufficient capacity to ensure that the interior of the forgings is fully forged. 4.4 Austenitic steel should undergo solution treatment, and martensitic steel should undergo quenching and fire treatment. 5 Technical requirements
5.7 Chemical composition
5.1.1 Smelting analysis
The chemical composition of steel should be based on the smelting analysis, and the results should comply with the provisions of Table 1. 5.1.2 Finished product analysis
Generally, finished product analysis is not performed for forgings. When the buyer requires it, it should be specified in the contract. The deviation of the finished product analysis results should comply with the provisions of Table 2.
5.2 Mechanical properties
The mechanical properties of the forgings after heat treatment should comply with the requirements in Table 3. 5.3 Appearance, dimensions and tolerances
5.3.1 Forgings are not allowed to have cracks, folds, shrinkage holes and other defects that seriously affect the surface quality. 5.3.2 The size and tolerance of each forging should meet the requirements of the ordering drawing. The Ministry of Mechanical and Electronics Industry of the People's Republic of China approved the implementation on 1993-07-01 on 1992-07-14
Category
Austenitic type
Martensitic type|| tt||Steel number
1Cr18Ni9
OCr19Ni9
1Cr18Ni9Ti
OCr18Ni11Ti
OCr18Ni11Nb
OCr25Ni20
2Cr25Ni20||tt ||1Cr13
ICr5Mo
4Cr9Si2
1Cr17Ni2
0. 08-≤1. 00
JB/T 6398 -: 92
Table 1
chemistry
:2.00—40.035
19.00||tt| |118.00
≤2. 00 ~≤0. 035 0. 030
17. 00-~ j 8. 00~
2. 000. 035/ ≤0. 030
42. 00 40. 035- 40. 030
0.08—1.00
50.08 1.00
≤0.08≤1.00
0.25—1.50
11.00||tt ||17. 00~ 1 9. 00~-
19.00 1 12.00
17. 00~ i 9. 00 ~
≤2. 00 ≤0. 035≤0. 030
0. 035/0.030
≤2. 00 -0. 035≤ 0. 030
#0.15#1.00#1.00
0.35~||tt ||0.45
≤1,00
0. 35~~ 2. 00-
40. 035A0. 030
1.000. 035
0.035—N0.030
0.0350 .030
≤0. 60≤0. 035—≤0. 030
0.700.0350.030
12. 00-||tt ||14.00
0. 80—0.0350.030
Note: The residual Cu content in the steel is not more than 0.20%, and the Ni content is not more than 0.60%. Table 2 Allowable deviation for finished product analysis
Specified chemical composition range
≥0. 03~0. 20
>0.02~0. 60
>1.00||tt ||1.00
>1. 00~ 3. 00
limit deviation value
lower deviation
upper deviation
0.005|| tt||0.01
0.005|| tt||Element
0.60| |tt||Specified chemical composition range
≥ 3. 00~10. 00
[0. 00~~ 15. 00
215. 00~20. 00||tt ||51.00
>1. 00~5. 00
5. 00~~10. 00
>10. 00~~20. 00
>0 . 60~0.20
>1. 00~- 3. 00
-~ 0 . 80
limit deviation value
lower deviation
0.10||tt ||0.15
0. 05||tt ||0.07
Upper deviation
0. 07|| tt||0.10
No.|| tt||1Cr18Ni9
OCr19Ni9
1Cr18Ni9Ti
CCr18Ni11Nb
OCr18NiT1Ti
0C125Ni20
2Cr25Ni20
1Cr!3|| tt||2Cr13
1Cr5Mo
4Cr9Si2
1Cr17Ni2
JB/T6398
92|| tt||Table 3 Mechanical properties of forgings
Section (diameter, side length,
heat treatment type inscribed circle diameter or thickness)! mm(≤)
soluble
soluble||tt| |soluble
solid solution
soluble
solid solution
quenched and tempered
tempered
braid Tempering
Quenching and tempering
Braided tempering
Tempering
Tempering
75|| tt||75
540|| tt||735
1540 (520)
930|| tt||590
40|| tt||40
9||tt| |18
Note: ① When 1Cr18Ni9Ti is used as heat-resistant steel, its tensile strength ob should be greater than or equal to 520MPae (②) The hardness value is not used as a basis for acceptance.
6 Test methods
6.1 Chemical composition analysis
6.1.1 Smelting analysis should be done by sampling and analyzing each furnace during the pouring process. %
78|| tt||63
Hardness value
Table Zhang
1187|| tt||1187
192||tt| |12217
140~45
45-55|| tt | Extension part. For discs or solid forgings, at any point between half the radius and the outer surface; for hollow or ring forgings, at half the wall thickness, mechanical property specimens may also be taken from broken pieces. 6.1.3 Chemical analysis methods
Chemical analysis methods should be in accordance with the provisions of GB223. 6.2 Mechanical property test | | tt | | 6.2.1 Number of specimens | | tt | Among the forgings, take a set of specimens from one end of the forging. 6.2.1.2 For forgings with a unit weight of more than 3000kg, take one set of specimens from both ends of each forging. 6.2.1.3 The number of specimens in each set, one set of austenitic steel is one tensile specimen; Tensite steel - set of 1 tensile and 2 impact specimens. 6.2.2 Sampling position and direction
6.2.2.1 The sample should be taken from the extended section of the forging used for testing. For solid shaft forgings, longitudinal specimens should be taken at half the radius; for rectangular cross-section forgings, longitudinal specimens should be taken on the diagonal line of the section and one-fourth of the distance from the apex of the diagonal; for shaft forgings with a central hole, Take longitudinal specimens at the bisection point of the wall thickness; for ring and disc components, tangential specimens should be taken. 6.2.3 The tensile test method shall be in accordance with the provisions of GB228. 6.2.4 The impact test method shall be in accordance with the provisions of GB229. 6.2.5 The hardness test method shall be in accordance with the provisions of GB231. 6.3 Appearance, Dimensions and Tolerances
The appearance quality inspection of forgings shall be based on naked eye observation. 299
Acceptance and retest
7.1 Trial acceptance
JB/T 6398-92
The acceptance of forgings shall be carried out in accordance with the requirements specified in the standard or agreement. 7.2 Retest
If a certain result of the mechanical property test is unqualified, double the sample should be cut and the test repeated. If the result of a sample in the second test is unqualified, it can be heat treated again. Re-heat treatment shall not exceed 3 times. After re-heat treatment, re-sampling and testing shall be carried out according to regulations. 8 Certificate of Conformity
When the forgings leave the factory, the supplier shall provide the demander with a certificate of conformity of the inspection results of the items specified in the order contract. 9 Printing and packaging
Print the supplier's factory mark, contract number, drawing number, and melting furnace number on each forging at the corresponding steel ingot nozzle end. The surface of the machined forging must be protected against rust, and at the same time, it must be packaged and Avoid damage during transportation. 300www.bzxz.net
Category
Austenitic
Martensitic
[Cri8Nig
OCr19Nig| |tt||1Cr18Ni9Ti
OCr18Ni1iNb
OCr18Ni11Ti
OCr25Ni20
2Cr25Ni20
3Cr13||tt ||4Cr13
1Cr5Mo
4Cr9Si2
1Cr17Ni2
Additional instructions:
JB/T6398
Appendix A
Characteristics and uses of large stainless, acid-resistant, heat-resistant steel forgings (reference parts)
Table A1
Characteristics and uses
has good corrosion resistance and It has good cold workability, but due to its high carbon content and sensitivity to crystalline corrosion, it is not suitable for corrosion-resistant welding parts. It is mainly used for components with high corrosion resistance requirements, such as components of food processing, chemical and printing and dyeing industry equipment. It has better corrosion resistance than 1C118Ni9, has a certain ability to resist intergranular corrosion, and has good weldability. It can withstand repeated heating below 870℃. It is usually used as corrosion-resistant steel in the chemical, food, printing and dyeing and leather industry sectors. It has good heat resistance, corrosion resistance and anti-crystallization. Inter-corrosion capability and good welding performance. It can be used for chemical corrosion-resistant parts, pipes and structural parts of power and heating equipment. It has good corrosion resistance, heat resistance, good intergranular corrosion resistance, and good weldability. Suitable for chemical corrosion-resistant parts, also suitable for parts used under corrosion conditions of 400-900°C and welded structural parts for high temperatures. Its oxidation resistance is better than 0C113Ni13. In fact, it is mostly used as heat-resistant steel that can withstand repeated heating below 1035°C. Steel, suitable for nozzles, etc., has good resistance to atmospheric corrosion, and also has certain corrosion resistance in solution media. Steam turbine blades, stainless equipment and nuts, bolts, springs, and anti-crack equipment pipe accessories, nozzles, valves, etc. can be used to resist corrosion caused by the petroleum cracking process and can be used as reheat steam camps, petroleum cracking tubes, boiler hangers, steam turbines Cylinder liners, pumps, valves, piston rods, high-pressure hydrogenation equipment components and fasteners will not peel below 900°C. It has high thermal stability and thermal strength at 600-700℃. Can be used for components subject to loads below 700°C. Such as automobiles, internal combustion engines, ships, engine valves, extrusion rods, etc. It can also be used for heating furnace components below 900C, such as material trays, furnace bottom plates, etc.
has relatively high strength, hardness and toughness, and high corrosion resistance. It is suitable for parts such as spindles, shafts, and piston rods of chemical equipment, as well as components with high strength and high corrosion resistance required for aviation and ships. This standard was proposed and incorporated by the Deyang Large Casting and Forging Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Deyang Large Casting and Forging Research Institute. This standard was drafted by Chen Dajin.
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