GB/T 13820-2018 English PDF (GBT13820-2018)

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GB/T 13820-2018: Magnesium Alloy Castings
GB/T 13820-2018
Magnesium alloy castings
ICS 77.150.20
J31
National Standards of People's Republic of China
Replace GB/T 13820-1992
Magnesium alloy casting
Published on.2018-07-13
2018-08-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 13820-1992 "Magnesium Alloy Castings", compared with GB/T 13820-1992, the main technical content changes
as follows.
--- Modified the sampling part of the casting cut sample (see 6.3.2.1,.1992 edition 6.3.1);
--- Increase the mechanical properties of some alloys or cast samples (see 4.3.1);
--- Increased the inspection requirements for casting flux inclusions (see 4.5.3);
--- Increasing the surface of the zirconium-containing magnesium alloy casting allows segregation inhomogeneity in the form of lines, streamlines and spots (see 4.5.8);
--- Revised the inspection method for the chemical composition of castings (see 5.1,.1992 edition 5.1);
--- Revised the provisions of the group batch (see 6.1,.1992 version 6.1);
--- Added various types of casting inspection items (see 6.2);
--- Increased judgment and re-inspection (see 6.4);
--- Revised the requirements for re-sampling for analysis when the chemical composition of the alloy is unqualified (see 5.1.2,.1992 version 6.2.4);
--- Removed the routine test (see.1992 version 6.8).
This standard is proposed and managed by the National Foundry Standardization Technical Committee (SAC/TC54).
This standard is drafted by. Shenyang Foundry Research Institute Co., Ltd.
Participated in the drafting of this standard. Shanghai Magnesium-Magnesium Alloy Die Casting Co., Ltd., Shanghai Aerospace Precision Machinery Research Institute, CITIC Daika Co., Ltd.
Company, Shanghai Jiaotong University, Dongguan Yi'an Technology Co., Ltd., Shanxi Ruige Metal New Materials Co., Ltd.
The main drafters of this standard. Feng Zhijun, Li Yufei, Sun Gang, Liu Wei, Zhang Xuliang, Chi Xiumei, Yu Guokang, Bai Bangwei, Xie Liming, Wang Yingxin,
Peng Liming, Li Yangde, Li Weirong, Yan Guoqing, Chai Jianxue, Ma Xiaohu.
The previous versions of the standards replaced by this standard are.
---GB/T 13820-1992.
Magnesium alloy casting
1 Scope
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, and transportation of magnesium alloy castings (hereinafter referred to as "castings").
Loss and storage.
This standard applies to magnesium alloy castings produced by sand casting and metal casting.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 1177-2018 cast magnesium alloy
GB/T 6414 casting dimensional tolerances, geometric tolerances and machining allowances
GB/T 11351 casting weight tolerance
Methods of chemical analysis of magnesium and magnesium alloys - Part 1. Determination of aluminium content
Methods for chemical analysis of magnesium and magnesium alloys - Part 4. Determination of manganese content - periodate spectrophotometric method
Methods for chemical analysis of magnesium and magnesium alloys - Determination of silver content - Flame atomic absorption spectrometry
Methods of chemical analysis of magnesium and magnesium alloys - Part 7. Determination of zirconium content
Methods of chemical analysis of magnesium and magnesium alloys - Part 8. Determination of rare earth content
Methods of chemical analysis of magnesium and magnesium alloys - Part 9. Determination of iron content - Ortho- phenanthroline spectrophotometric method
Methods of chemical analysis of magnesium and magnesium alloys - Part 10. Determination of silicon content - Molybdenum blue spectrophotometric method
GB/T 13748.11 Methods for chemical analysis of magnesium and magnesium alloys - Determination of bismuth content
Methods of chemical analysis of magnesium and magnesium alloys - Part 12. Determination of copper content
Methods for chemical analysis of magnesium and magnesium alloys - Part 14. Determination of nickel content - succinimide spectrophotometric method
Methods of chemical analysis of magnesium and magnesium alloys - Part 15. Determination of zinc content
GB/T 13748.20 Methods for chemical analysis of magnesium and magnesium alloys - Part 20
Methods of chemical analysis of magnesium and magnesium alloys - Part 21. Methods
Prime content
Methods of chemical analysis of magnesium and magnesium alloys - Part 22. Determination of bismuth content
GB/T 15056 casting surface roughness evaluation method
GB/T 19943 Non-destructive testing of metal materials X and gamma radiography detection basic rules
GB/T 32792 Magnesium alloy processing products packaging, marking, transportation, storage
HB/Z60 X-ray inspection
HB/Z61 penetration test
Repair welding process and inspection of HB/Z328 magnesium alloy castings
HB5462 magnesium alloy casting heat treatment
HB6578 Standard reference ray film for inspection of aluminum and magnesium alloy castings
Flux inclusion test for HB7738 magnesium alloy ingots, castings and parts
3 casting classification
3.1 According to the working conditions and uses of castings and the degree of damage caused by damage during use, there are three categories, see Table 1.
Table 1 Casting classification
Casting category definition
I Heavy load, complicated working conditions, used in key parts, castings will damage the important castings that are safe for the whole machine.
II With medium load, used for important parts, casting damage will affect the normal operation of the parts, castings causing accidents
III Castings for general parts with or without load
3.2 The type of casting is specified by the purchaser on the drawing.
The casting pattern is marked as follows.
Tag example.
ZM6-S-T6
I-GB/T 13820
Castings of unspecified category are considered Class III castings.
4 Technical requirements
4.1 Chemical composition
The chemical composition of the castings shall comply with the provisions of GB/T 1177-2018.
4.2 Delivery status
4.2.1 The state of supply of the castings shall be indicated on the drawings by the purchaser or specified in the agreement.
4.2.2 Unless otherwise specified, the heat treatment of castings shall be carried out in accordance with the provisions of HB5462.
4.3 Mechanical properties
4.3.1 The mechanical properties of Class I castings or cast samples shall comply with the requirements of Table 2. The mechanical properties of Class II castings or cast samples shall be provided by
It is agreed by both parties that Class III castings may not be tested for mechanical properties. The mechanical properties of single casting samples of Class I and Class II castings are to comply with GB/T 1177-2018.
Provisions.
Table 2 Mechanical properties of casting body or cast sample
Alloy grade alloy code sampling part casting method
Sampling site
Thickness/mm
Heat treatment
status
tensile strength
Rm/MPa
Prescribed plastic extension
Degree Rp0.2/MPa
Elongation after break
A/%
Average value, minimum value, mean value, minimum value, minimum value
ZMgZn5Zr ZM1
ZMgZn4RE1Zr ZM2
ZMgRE3ZnZr ZM3
ZMgRE3Zn3Zr ZM4
ZMgAl8Zn
ZMgAl8ZnA
ZM5
ZM5A
ZMgNd2ZnZr ZM6
ZMgZn8AgZr ZM7
ZMgAl10Zn ZM10
ZMgNd2Zr ZM11
No regulation
Class I casting
Designated part
Class I casting
Non-designated part;
Type II casting
No regulation
Class I casting
Designated part
Class I castings
Designated part;
Type II casting
No regulation
No regulation
S, J
S, J
S, J
S, J
S, J
No regulation
≤20
>20
No regulation
≤20
>20
No regulation
No regulation
T1 205 175 120 100 2.5 -
T1 165 145 100 - 1.5 -
T2 105 90 - - 1.5 1.0
T1 120 100 90 80 2.0 1.0
T4 175 145 70 60 3.0 1.5
T6 175 145 90 80 1.5 1.0
T4 160 125 70 60 2.0 1.0
T6 160 125 90 80 1.0 -
T4 180 145 70 60 3.5 2.0
T6 180 145 90 80 2.0 1.0
T4 165 130 - - 2.5 -
T6 165 130 - - 1.0 -
T4 150 120 - - 1.5 -
T6 150 120 - - 1.0 -
T4 170 135 - - 2.5 1.5
T6 170 135 - - 1.0 -
T6 180 150 120 100 2.0 1.0
T4 220 190 110 - 4.0 3.0
T6 235 205 135 - 2.5 1.5
T4 205 180 - - 3.0 2.0
T6 230 190 - - 2.0 -
T4 180 150 70 60 2.0 -
T6 180 150 110 90 0.5 -
T6 175 145 120 100 2.0 1.0
Note 1. “S” means sand casting, “J” means metal casting; when two main heat dissipation surfaces of a part of the casting are formed in the sand core, according to the sand casting
Performance.
Note 2. The average value refers to the average value of the three samples on the casting, and the minimum value means that one of the three samples is allowed to be lower than the average but not lower than the minimum value.
4.3.2 When the casting has high temperature mechanical properties, the specific testing items and indicators can refer to Appendix A of GB/T 1177-2018.
The supply and demand sides agreed.
4.4 Geometric, dimensional and weight tolerances
4.4.1 The geometry and dimensions of the castings shall conform to the requirements of the drawings. The dimensional tolerances of the castings shall comply with the provisions of GB/T 6414. Have special needs
When seeking time, it should be marked on the drawing.
4.4.2 When the demander has requirements on the weight of the casting, it shall be agreed with the supplier.
4.5 Surface quality
4.5.1 The castings shall be cleaned and free of flashing edges and burrs. The risers on the non-machined surfaces shall be cleaned to the surface of the casting. To be processed
The residual amount of the riser on the surface should not be 5mm higher than the surface of the casting, which should not affect the X-ray inspection.
Agreed.
4.5.2 The surface of the casting is not allowed to have cold insulation, cracks, shrinkage holes, penetrating defects and serious defects (such as insufficient pouring, mechanical damage, etc.).
4.5.3 The variety and quantity of the flux inclusion test in the constant humidity chamber shall be indicated by the purchaser in the drawings or technical agreement. Need to be in constant humidity
For castings with flux inclusion inspection in the box, the amount and size of flux inclusions on all surfaces before cleaning shall not exceed the requirements of HB7738.
4.5.4 Any defects within the range of machining allowances are allowed to be processed on the surface to be machined.
4.5.5 The part used as a machining reference on the casting shall be flat.
4.5.6 The non-machined surface of the casting and the surface after processing shall be in accordance with the requirements of Table 3 for the holes existing after cleaning. Casting surface defect
Should not exceed the following range.
a) After the casting is oxidized, a non-machined surface is allowed to have a scattered dot shape with a diameter of not more than 1.5 mm and a depth of not more than 1 mm.
Surface holes, which are allowed to have scattered point-like surface holes with a diameter of not more than 1 mm and a depth of not more than 0.5 mm.
b) The depth of a single hole and a group of holes shall not exceed 1/3 of the wall thickness; on the installation side, shall not exceed 1/4 of the wall thickness,
The opposite side of the same section of the defect shall have no similar defects in its symmetrical part.
c) Defects are not allowed in the threaded holes and the screws are screwed into the four teeth.
d) Defects other than those specified above shall be agreed upon by the supplier and the buyer.
Table 3 Allowable defects on the surface of castings
Casting type
Casting surface
Product/cm2
casting
category
Allowable defect
Single hole grouping hole
Hole
diameter
Hole
depth
At 10cm×
10cm area
Number of holes in it
In a cast
Hole in the piece
Number of holes
Between holes
the distance
Hole
diameter
Hole
depth
At 3cm×
3cm area
For a group of them
Number of holes
In a cast
Group
Quantity
Mm mm mm groups
≤ ≤ ≥ ≤ ≤
Hole edge
Distance from casting
Edge or inner hole
Edge distance
Away/mm
Small castings ≤1000
I 4 3 3 4 20 2 1.5 4 2
II 4 3 3 4 20 2 1.5 5 2
III 4 3 3 5 15 2 1.5 6 3
Medium casting
>1000
~6000
I 4 3 3 8 30 2 1.5 4 3
II 4 3 3 8 30 2 1.5 5 3
III 4 3 3 9 25 2 1.5 6 3
Not less than the hole
The largest straight hole
2 times the diameter
Table 3 (continued)
Casting type
Casting surface
Product/cm2
casting
category
Allowable defect
Single hole grouping hole
Hole
diameter
Hole
depth
At 10cm×
10cm area
Number of holes in it
In a cast
Hole in the piece
Number of holes
Between holes
the distance
Hole
diameter
Hole
depth
At 3cm×
3cm area
For a group of them
Number of holes
In a cast
Group
Quantity
Mm mm mm groups
≤ ≤ ≥ ≤ ≤
Hole edge
Distance from casting
Edge or inner hole
Edge distance
Away/mm
Large casting
>6000
~8000
I 4 3 3 15 30 2 1.5 4 5
II 4 3 3 15 30 2 1.5 5 5
III 4 3 3 17 25 2 1.5 6 6
Very large castings>8000
I 4 3 3 28 30 2 1.5 4 7
II 4 3 3 28 30 2 1.5 5 7
III 4 3 3 30 25 2 1.5 6 8
Not less than the hole
The largest straight hole
2 times the diameter
4.5.7 On the non-machined surface of metal castings, traces such as mold type, wrong box, ejector pin and vent plug are allowed, but the bulge should not exceed
The surface 1mm or the recess should not be lower than the surface by 0.5mm.
4.5.8 The surface of the casting is allowed to have gray spots formed by reverse segregation of magnesium and aluminum. The surface of the zirconium-containing magnesium alloy casting is allowed to have lines, streamlines ...