JB/T 5000.6-1998 General technical conditions for heavy machinery steel castings

JB/T 5000.6-1998 This standard specifies the technical requirements, test methods and inspection rules, marking and packaging of carbon steel and low alloy steel castings for heavy machinery. This standard applies to carbon steel and low alloy steel castings cast in sand molds or molds with thermal conductivity equivalent to sand molds. This standard does not apply to special purpose castings such as high manganese steel, heat-resistant steel and stainless steel. (Note: This standard is not equivalent to ISO 3755 "Cast Carbon Steel for General Engineering Use" (1991 edition), ISO 4990 "General Technical Delivery Conditions for Steel Castings" (1986 edition) and ISO 8062 "Dimensional Tolerances and Machining Allowances for Castings" (1991 edition) of the International Organization for Standardization and SMS SN200/5 "Machining Specifications for Titanium Parts" (1992 edition) of SMS Magnetics of Germany.) JB/T 5000.6-1998 General Technical Conditions for Heavy Machinery Castings JB/T5000.6-1998 Standard download decompression password: www.bzxz.net

JB/T 5000.6—1998
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Preface
This standard was proposed and managed by the Deyang Large Casting and Forging Research Institute of the Ministry of Machinery Industry. This standard was drafted by: Shenyang Heavy Machinery Factory. The main drafter of this standard: Wu Dongmei
1 Scope
Mechanical Industry Standard of the People's Republic of China
General Technical Conditions for Heavy Machinery
Steel Castings| |tt||The heavy mechanical general techniques and standardsSteel castings
JB/T 5000.6--1998
This standard specifies the technical requirements, test methods and Inspection rules, marking and packaging, etc. This standard applies to carbon steel and low alloy steel castings cast in sand molds or molds with thermal conductivity equivalent to sand molds. This standard does not apply to special-purpose castings such as high manganese steel, heat-resistant steel and stainless steel. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB222--84 Sample sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB223.1~223.75--81~91 Chemical analysis method of steel and alloy GB228-87 Metal tensile test method
GB229- -94 Metal Charpy notch impact test method GB231-84 Metal Brinell hardness test method GB/T6060.1-1997 Surface roughness comparison sample casting surface GB/T15056-94 Casting surface roughness evaluation method JB/T5105-91 Castings Pattern draft angle
JB/T6397-92 Large carbon structural steel forgings JB/T5000.7--1998 General technical conditions for heavy machinery Welding repair of steel castings JB/T5000.12--1998 General technology for heavy machinery Conditional coating JB/T5000.13-1998 General technical conditions for heavy machinery packaging 3 Technical requirements
3.1 Carbon steel grade and its chemical composition and mechanical properties 3.1.1 Carbon steel grade and its chemical composition and mechanical properties should comply with The provisions of Table 1 and Table 2. State Machinery Industry Bureau approved on 1998-09-30 for implementation on 1998-12-01
carbon steel grade
ZG200-400
ZG230-4501||tt| |ZG270-500
ZG310-570
ZG340-640
JB/T 5000.6-·1998
Table 1
Chemical composition of carbon steel
public
containing
elements
o||tt| |0.04
Every time the upper limit of each brand decreases 0.01% carbon can increase manganese by 0.04%. The manganese of ZG200-400 is at most 1.00%, and the manganese of the other four brands is at most 1.20%.
The total amount of residual elements is not greater than 1.00%. If the party has no requirement, residual elements may not be analyzed. Table 2 Mechanical properties of carbon steel
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Elongation
Carbon steel grade
ZG200-400
ZG230-450
ZG270-500
ZG310-570
2G340-640
yield strength
MPa|| tt||200
≥270
≥310
Tensile strength
≥500
When the buyer has no requirement - AkY and Aku can be chosen by the supplier%||tt ||≥25
Performance
According to contract selection
Shock absorption Work
Shrinkage
Strong
2 The casts listed in the table The steel grade performance is suitable for castings with a thickness of no more than 100mn. When the thickness of the casting is greater than 100mm, the screen strength specified in the table is for design reference only.
3.1.2 The grade of low alloy steel and its chemical composition and mechanical properties shall comply with the provisions of Table 3 and Table 4. 164
Low alloy steel grade
ZG40Mn
ZG40Mn2
ZG50Mn2
ZG20Mn
ZG35Mn||tt| |ZG35SiMnMo
ZG35CrMnSi
ZG20MnMo
ZG55CrMnMo
ZG40C11
ZG34Cr2Ni2Mo
ZG20CrMo
ZG35Cr1Mo
ZG42Cr1Mo
ZG50Cr1Mo
0.40|| tt||0.30~
0.38~|| tt||045
0.20| |tt||0.40
0.75||tt| |0.20
0.25 ~| |tt||0.50
JB/T 5000.6.-.1998
Table 3 Chemical composition of low alloy steel
1.10~||tt| |1.40
0.80||tt ||0.60~
0.80| |tt|| content
0.0350.035
0.80~||tt| |1.10
0.90| |tt||1.20
0.60||tt| |0.20~
ZG65Mn
ZG28NiCrMo
ZG30NiCrMa
ZG35NiCrMo
0.25 ||h||0.30||h||0. 25~
1 0. 30～
JB/T5000.6-19.98
表3（完）
0.70~~|| tt||1.00
0.90||tt ||Mo
注：残余素内容：Ni≤0.30%, Cr≤0.30%, Cu≤0.25%, M0≤0.15 %，V≤0.05%，Residual elements are not greater than 1%. ||低亳面钢牌号
ZG30Mn
ZG40Mn
ZG40Mn2
ZG50Mn2
ZG20Mn
ZG35Mn
ZG35SiMnMa|| tt||ZG35CrMnSi
AZG20MnMo
ZG55CrMnMo
正火+回火
正火十回火|| tt||正火+回火
正火十回火
正火+间火
调||tt| |质
正火+回火
正火叶闽火
责||tt| |正火十回火
正火十回火
正火+回火
≥300||tt| |≥295
>395
≥685
2415||tt ||≥395
不这些
≥550|| tt||2640
≥590
500650—
640|| tt||640
不舵定
212|| tt||220
212||tt ||2 E
>55
30|| tt||≥20
??????
35||tt ||239
35||tt ||27
≥163
269302
≥143|| tt||150~~190
≥156
低亳面钢牌号
ZG40Crl
ZG34Cr2Ni2Mo
ZG20CrMo||tt ||ZG35C11Mo
ZG42CrIMo
ZG50CtiMo
ZG65Mn
ZG28NiCrMo
ZG30NiCrMo
ZG35NiCrMo
热电影
正火十回火
质||tt ||贪
正火+回火
≥700
≥ 245. ||JB/T5000.6—1998
Table 4 (end)
Academic
9501000
740~-880
690~830
1740~880
Not specified
≥630
When the purchaser has no requirements? The supplier can select any one of Aku, Akv, and AkDvm. IIB is not used as the basis for acceptance and is for design reference only. 2
Performance
3.2 Surface quality
3.2.1 The sand adhesion, sand inclusion, flash, burr, pouring head and oxide scale on the casting should be cleaned up. 3.2.2 The surface roughness of the casting should meet the requirements of Table 5. Table 5
Casting
Weight
>5000
3.3 Welding repair
Casting surface roughness
Surface roughness parameter value
Rz≤800
When the purchaser has no requirements, the supplier can weld repair the casting defects. The welding repair should be carried out in accordance with the provisions of JB/T5000.7. HB
240~290)
200250
220~260
3.4 ??Dimensional tolerance
3.4.1 Tolerance grade is CT13~CT15, tolerance value is shown in Table 6. Tolerance grade is selected according to the maximum size of rough casting, and the tolerance grade of all smaller sizes belonging to this casting is the same as the tolerance grade of the maximum size of this casting. 167
Basic size of hair ring casting
>10～16
≥16～25
>25~40
>40～63
>63～100
>100～160
>160～250
≥250～400
≥>400～630
≥630~~1000
[0001600
>1600~2500
≥2500～4000||t t||>4000～6300
>6300～10000
Method
JB/T5000.6-1998
Table 6 Casting size tolerance value
Chief||tt| |Ring
Difference
16||t t||20
The basic size of the rough casting refers to the size of the rough casting before machining, which should include the machining allowance and draft angle. mm
For rough castings with basic dimensions not exceeding 16mm, the tolerance values ??of CT13~~CT15 are selected according to CT12. For rough castings with basic dimensions exceeding 2
16~25mm, the tolerance grade is increased by one level. 3 Generally, the tolerance value within the thick frame is selected. 3.4.2 The tolerance zone should be symmetrical to the basic size of the rough casting, that is, half of the tolerance value is positive and the other half is negative (see Figure 1). When there are special requirements, the tolerance zone can also be asymmetrically configured, but it should be marked separately after the basic size. For example: 95 ± 3 or 200-5. Basic size of rough casting
Finished size
Minimum limit size
Maximum extreme size
Figure 1 Tolerance limit
3.4.3 The misalignment (see Figure 2) value should be within the tolerance value of Table 6. When the misalignment value is further restricted, the maximum misalignment value should be marked on the drawing. For example: general tolerance CT13, maximum misalignment value 1.5. 168
Maximum misalignment
JB/T5000.6-
--1998
Maximum misalignment
Minimum limit size
Maximum limit size
Figure 2 Maximum misalignment
Maximum pin type
3.4.4 The wall thickness dimension tolerance grade should be one level coarser than the tolerance grade selected for the casting. For example: if the tolerance grade selected for the casting is CT13, the wall thickness dimension tolerance grade should be CT14. 3.4.5 The upper limit of the inner and outer fillet tolerance of the casting should be the tolerance value in Table 6, and the lower limit should be zero. 3.4.6 The bevel tolerance should be symmetrically arranged along the bevel (see Figure 3). Drawing marking
Slope+
Basic dimension
Description
Basic dimension
Figure 3 Tolerance zone of inclined surface
J/T5000.6
Slope+
Figure 3 (End)|| tt||The drawing shall specify whether the slope is increasing, decreasing or averaging the material, for example: 1998
Slope +, Figure 3a)
Slope 1, Figure 3b)
Slope +, Figure 3c)
Special surface slopes that are different from the slopes on the drawing shall be marked separately on the surface, for example: +12
Regardless of the slope specified on the drawing, for the processing size, in order to obtain the finished product size, "slope +" shall be used. 3.5 Machining allowance (RMA)
3.5.1 The machining allowance should comply with the provisions of Table 7. The machining allowance should be selected according to the maximum outer dimension of the finished casting after final processing (see Figure 4). The machining allowances for all smaller dimensions belonging to this casting are the same as for the largest outer dimension. surface? Processing allowance
Maximum overall size
>30～50
>50～180
>180~～315
>315~500
>500~800
>800~1250
>1250~1600
≥1600~2500
>2500~3150| |tt||>3150~4000
>4000~6300
>6300~10000
Note: The machining allowance does not include the draft angle, 170
Noodles
25| |tt||30
Remainder
Amount
Amount added to the surface
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