This standard specifies the technical requirements, inspection methods and acceptance rules for annealing, normalizing and tempering of metal cutting machine tool parts. This standard applies to carbon steel, alloy steel and other parts that have been annealed, normalized and tempered. JB/T 8491.1-1996 Technical conditions for heat treatment of machine tool parts Annealing, normalizing and tempering JB/T8491.1-1996 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T 8491.196
Technical Conditions for Heat Treatment of Machine Tool Parts
Annealing, Normalizing, Quenching and Tempering
Published on November 0, 1996
Ministry of Machinery Industry of the People's Republic of Chinawww.bzxz.net
Implementation on January 1, 2007
JB/T 8491.196
This standard is formulated on the basis of summarizing the production experience of machine tool parts in my country and referring to relevant foreign technical data.
This standard is based on the technical conditions of 1B/T54214-94 for annealing, normalizing and quenching and tempering of machine tool parts.
This standard is proposed by the National Standardization Technical Committee of China: This standard is not the responsibility of the Ministry of Machinery Industry, Beijing Machine Tool Department. International Standard Starting Unit: Machine Tool Research Institute of the Ministry of Industry This standard was first issued in 1994,
Machinery Industry Standard of the People's Republic of China
Heat treatment technology of machine tool parts
Annealing, normalizing, quenching and tempering
JH/T 8491.196
Represented by 5414-04
This standard specifies the technical requirements, test methods and acceptance criteria for annealing, normalizing and tempering of metal cutting machine tool parts (hereinafter referred to as parts).
This standard specifies the parts of metal cutting machine tools such as annealing, normalizing and quenching and tempering.
This standard specifies the parts of metal cutting machine tools such as annealing, normalizing and quenching and tempering of metal cutting machine tool parts (hereinafter referred to as parts).
This standard specifies the parts of metal cutting machine tools such as annealing, normalizing and quenching and tempering of metal cutting machine tool parts. 2
References to standards
The following standards contain provisions that are incorporated by reference in this standard as provisions of this standard. When this standard is issued, the texts shown are exclusive. The relevant standard departments will be referred to, and the parties to the standard should explore the possibility of using the new version of the same standard. CB 224-$7
GR 25I-84
G12S8-86
GS129995
CB 63!4-35
GB/T 12298-al
YE(T11--EC
3 Appearance quality
Method for determining the depth of demagnetization layer of steel
Method for testing the low hardness of gold screen cloth
Tool technology parts
Technical conditions for gold tool steel
Metal flat product tensile test method
Metal microstructure test method
High carbon rail bearing steel
3.1 The surface of the piece shall not have cracks and other defects that may cause damage. 3.1 Inspection and measurement shall be carried out by internal sampling or low-power observation. Surface hardness
The surface hardness after annealing shall generally meet the requirements of Table 1. . 4.1
T3, TRA
Machine Washing Industry Department approved on 1996-11-07
Henan HHS
156187
163~157
190--237
179~229
CCT15SiMn
W6M5CrV2
East China Standard
173--225
2uy-2as
156~=a?
168-1V
11 implementation
JB/T 8491.1--96
4.2 The following pots' hardness after normalizing generally conforms to the requirements of Table 2.
20:TMe
HBs
174--217
175-224
19725:
153~307
149-187
133217||t t||The scale after engraving the number
should generally comply with the requirements of Table 3.
T12,TI2A
Goo's original scale HES
253~-29
893--3
220~23G
2G1~·23G
200--330
226-250
250--280|| tt | 9
Bruce seat by seat JI35||t t||25--23r
22C·250
250--2BC
272--301:
220--50
50-230
27G--300
220-550
For parts with special requirements for toughness or hardness other than those in this standard, their strength and hardness shall comply with the specifications in the drawings and process documents. 4.5 The strength shall be measured on the parts according to the method specified in the standard. When the specified method is not suitable, other strength test methods may also be used.
5 Microstructure
5.1 Microstructure of tool steel after spheroidizing annealing H1298 second class national semi-standard, pearl 2~1 level qualified for bowl-shaped parts when the cross-sectional size is smaller than 60mm. 1~2 level qualified: when the part surface size is greater than 60mm, 1-3 level qualified.
5.2 Microstructure of tool steel parts after spheroidizing annealing is evaluated according to GR1239 first class, first level diagram, pearl 2~5 level qualified. 5.3 The microstructure of high chromium bearing steel after spheroidizing annealing shall be evaluated according to the YB[T>1 standard six, the first level diagram, the spheroid is 2 to 5 level qualified: the carbide is 1--2 level qualified,
5.4 The microstructure of structural steel and alloy structural parts after quenching should be uniformly distributed ferrite plus lamellar pearlite. 63 is the first level of production: 58 level will be the standard, 5.5 steel, alloy steel parts of the surface microstructure is generally tempered and less than or equal to 5% of the ferrite,
5.6 parts after quenching and tempering decarburization layer according to the method specified in B224 compensation inspection, the surface decarburization layer depth should be less than one third of the single-sided processing disease
5.7 inspection microstructure according to the method specified in GB/T13298 on the same treatment of the sample, when there is a difference must be Zero measurement
6 Deformation
6.1 The deformation of the parts shall meet the requirements of the necessary process delivery parts. 6.2 Parts with deformation exceeding the tolerance can be corrected. Parts with high accuracy and stability requirements shall be stress relieved after correction. 7 Acceptance criteria
.1 The parts shall meet the relevant indicators specified in the requirements to be qualified. 7.2 Appearance quality, surface roughness and deformation are mandatory inspection items. Each part shall be inspected. The others are optional inspection items. The inspection items shall be clearly indicated in the work document.
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