JB/T 6979-1993 Quality classification of large and medium-sized steel forged modules (ultrasonic and inclusions)

This standard specifies the classification rules for steel forged modules according to different stress conditions and the quality classification indicators of various modules in different use ranges. This standard is applicable to steel modules for hammer forging, counter hammer forging, flat forging, mechanical press forging, roll forging, and hydraulic press forging. This standard is also applicable to steel modules for processes such as non-ferrous metal die-casting and plastic molding. JB/T 6979-1993 Large and medium-sized steel forged modules (ultrasonic and inclusions) Quality classification JB/T6979-1993 Standard download and decompression password: www.bzxz.net

Machinery Industry Standards of the People's Republic of China
Large and medium-sized steel forged modules
(ultrasonic and inclusion) quality classification
Subject content and scope of application
JB/T 6979 -- 93
This standard specifies the classification rules for steel forged modules according to different stress conditions and the quality classification indicators of various modules in different use ranges.
This standard applies to hammer forging, counter hammer forging, flat forging, mechanical press forging, roll forging, hydraulic press forging steel modules. This standard also applies to steel for non-ferrous metal die-casting and plastic molding processes. module. 2 Reference standards
Technical conditions for high-quality carbon steel
GB 1299
GB 3077
GB4228
GB 8844||tt ||GB 10561
Technical conditions for alloy tool steel
Technical conditions for alloy structural steel
Broken stainless steel for forgings
Technical conditions for die-casting molds
Steel China Africa Method for microscopic evaluation of metal inclusions GB11880
JB/T 6057
HR/Z 5138
Technical conditions for plastics for modules used in die forging hammers and large mechanical forging presses Steel for the ring part of the mold and its heat treatment technical conditions 3Cr3Mo3VNb hot work die steel Classification of steel for refining and ingot forging modules
Grade of steel for modules and chemical composition should comply with Table 1. Table 1
5CrMnMo
5CrNiMo
4CrMnSiMoV
4SiMnMoV
Mn||tt| |1.20~
0.80||tt ||1.10
1.30~|| tt||1.50
（%）
0.30| |tt||1.40~
Approved by the Ministry of Machinery Industry of the People's Republic of China on 1993-07-27 302
Standard number
≤0. 030≤0. 030: CB 1299||tt ||S0. 030 0. 030G 1299
1≤0. 0300. 030GB 1299
50. 030 50. 030 G 11880
1994-07-01 Implementation||tt| |Steel
4Cr2MoVNi
5CrNiMoy
3Cr2MoWVNi
4Cr5W2VSi
3Cr3Mo3VNb||tt| |4Cr5MoVSi
4Cr5MoSiV1
0.43||tt| |0.32~
3Cr2NiMnMc
3Cr2Mo
Mn| |tt||Si
No.40||tt| |M0.35
1.20|| tt||0.17~
Note: Other steel types with similar properties are allowed to be used. JB/T 6979
Continued Table 1
Chemistry
1.10~||tt ||1.50
2.60~| |tt||3.20
1.10| |tt||1.40~
(%)||tt| |Mo
V|| tt||0.10~
1.75||tt| |0.25
2 The content of residual elements should comply with the provisions of the corresponding standards. 3.2
According to the impact force received by the module during use, the classification is as shown in Table 2 Show. 3.3
Table 2
Stress conditions
Module usage range
4 Module quality classification technical indicators
Module size deviation
High impact category H
hammer forging die
The limit deviation of the module size of the hammer forging die
should comply with the requirements in Table 3. 0.80
0.80|| tt||1.60~
Standard number
0.030≤0.030|GR 11880
0.0300.030 G13 11880
150.030—0.030
Metallurgy Department
Appraisal Certificate
0. 03010. 030 G3 1299
≤0. 030 0. 030HB /Z 3138
0. 3000.0301 GB 1299
≤0.0300. 030:GB 1299
0. 0350.035
0. 0350. 035GB3077
≤0. 015≤0. 020 JB/T 6057
≤0. 030≤0. 035/ GB 4228
≤0. 0301≤0. 030
GB1299
Medium impact type M
Flat forging die
Machine forging die
Forging die
Low impact type L| |tt||Metal die-casting mold
Plastic mold
Wave press forging die
Processing method| |tt||Six-sided processing
Black leather module
200300
>300~600|| tt||600
The surface accuracy of the module should comply with the requirements in Table 4.
Processing method
Six-sided processing
Black leather module
Corner radius
JB/T 6979-93
Table 3| |tt||High
Table 4
vertical
face length
straight
300||tt| |>300
Degree
Width,
日| | tt | tt||High Type H
Quality Inspection
Inclusions
Ultrasonic flaw detection|| tt ||304 ||tt || Defects
Defects. Within an area of ??100cm2, metallurgical defects with an equivalent diameter of 2~~4 mm shall not exceed
, of which metallurgical defects with an equivalent diameter of ~4
mm shall only 1.
is allowed to have 2 to 4 dense areas of metallurgical defects smaller than the equivalent diameter
$2mm, but
each area shall not exceed 10cm2, and the spacing between each area || tt||must not be less than 150mm. No white spots, cracks, shrinkage holes and other defects are allowed inside the module
Quality
Various inclusions Levels are all ≤2.5
It is allowed to have individual, scattered metallurgical defects that are not
larger than the equivalent diameter $2mm
within an area of ??100cm2 and have an equivalent diameter of 424mm. Gold defects shall not exceed
, among which only 1 metallurgical defect with an equivalent diameter of $3~~4
mm is allowed, and 2 to 4 metallographic defects with an equivalent diameter of $3~~4
are allowed.
mm dense areas of metallurgical defects, but each
area shall not exceed 10cm2, and the spacing between each area shall not
be less than 150mm, except for
modules that weigh more than 5t. Metallurgical defects of 1
equivalent diameter mm
are allowed outside the multimeter (strip). White spots, cracks, shrinkage holes and other defects are not allowed inside the module
| tt | |Grade regulation
The main parts of the mold must comply with
Conform to the Class B regulations of this category
Category
Medium impact category M
Low impact| | tt | tt||Inclusions
Detected
Acceptance rules
JB /T 6979 | No
metallurgical defects larger than equivalent diameter $2mm
depression. Within an area of ??100cm2, the equivalent straight
amount
minutes|| tt||Grade index
The levels of various inclusions are ≤2.5
The equivalent diameter of individual dispersions is ≤good
The main parts of the mold must meet the
grade regulations
The main parts of the mold must comply with the
grade regulations
mm defects will not be counted. Within the area of ??
of \00 cm2, the equivalent diameter is $3$6mm of
! Only one defect is allowed, and metallurgical defects with diameters of 2 to 4 to 4 mm are allowed. The number of metallurgical defects shall not exceed
, of which the equivalent diameter is $3 to 4
less than the equivalent diameter of 2 mm. Metallurgy
mm is only allowed to have one metallurgical defect.
is allowed to have 2 to 4 dense areas of metallurgical defects smaller than the equivalent diameter 2
mm, but each
area shall not exceed 10cm, and the distance between each area shall not be less than
150mm,
modules weighing more than 5t are allowed to have 1
metallurgical defects
with an equivalent diameter of 6mm, except for double rulers (long strips). Defects such as white spots, cracks, shrinkage holes, etc. are not allowed inside the module
Hydraulic machine forging mold level 2.5, die-casting mold
Level 2.0, plastic mold ≤1.5 level
Hydraulic machine forging mold allowed There are individual
metallurgical defects with dispersed equivalent diameters not greater than 3. Within an area of ??100mm2,
no more than
4 defects with equivalent diameter Φ36mm, of which only 1
is allowed for 6m, and 2~~4 are allowed Metallurgical defects smaller than
equivalent diameter $2mm are densely clustered
, but each area shall not exceed 10cm, and
shall not be less than 150mm apart.
White spots, cracks, and shrinkage holes are not allowed. www.bzxz.net
Die-casting molds and plastic molds, ultrasonic flaw detection
Indicators should comply with Class A of medium impact category
Regulations
Defect intensive area. But each area shall not exceed 10|| tt||cm, the distance between each area is not less than 150mm.
Defects such as self-pointing, cracks, shrinkage holes, etc. are not allowed
Hydraulic machine forging mold ≤2.5, die-casting mold
≤2.5. Plastic mold ≤ Level 2.0
In the main parts of the mold, various defect indicators
shall comply with the Class A regulations of this category
5.1 Module size deviation shall comply with Articles 4.1 and 4.2 Regulation. 5.2 The limit dimensional deviation of die-casting molds and plastic modules should be implemented in accordance with GB8844 and JB/T6057. 5.3 The classification and grading indicators of module inclusions and ultrasonic flaw detection should comply with the provisions of Table 5. 5.4 Other technical requirements and acceptance rules of the module are implemented in accordance with relevant standards. 6 mark
In the main parts of the mold, the inclusions
level requirements should at least meet the level 3
regulations
without affecting the quality of the mold forming surface
Basically, the flaw detection index
shall be determined through negotiation between the supplier and the buyer
6.1 Each module shall be stamped by the manufacturer (the stamp shall be in 25~~40mm characters). The stamp shall include the name of the manufacturer and the contract number. , melting furnace number, steel 303
JB/T6979--93
number, standard number. Print a double arrow "-→" on the side parallel to the fiber direction to indicate the steel fiber direction of this module. 6.2 Add the classification number and grade number of the module below the module stamp. As follows; High Impact Category
Medium Impact Category
Low Impact Category
Level A
Level B
Level C
H|| tt | Quality warranty for the following content: 6.3
Module stamp:
b. Various test results;
c. Delivery status,
d. Drawing number (or specification, quantity);
e. standard encdoing.
Additional notes:
This standard is proposed and managed by the Beijing Mechanical and Electrical Research Institute of the Ministry of Machinery. This standard is drafted by Beijing Mechanical and Electrical Research Institute, Qiqihar Steel Plant, Beijing Heavy Machinery Plant and Changchun First Automobile Manufacturing Plant. The main drafters of this standard are Li Yalan, Chu Zuoming, Li Xinghua, Liao Andi, Yang Jing and Li Liping. 306
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