JB/T 9222-1999 JB/T 9222-1999 Powdered coal for wet casting JB/T9222-1999 Standard download decompression password: www.bzxz.net

JB/T 9222-1999
This standard is a revision of ZBJ31002-88 "Powdered Coal for Green Sand Mold Casting". During the revision, the original standard was edited, and the main technical content remained unchanged.
This standard replaces ZBJ31002-88 from the date of implementation
Appendix A of this standard is a reminder appendix.
This standard is proposed and managed by the National Technical Committee for Foundry Standardization. The responsible drafting unit of this standard: Shenyang Foundry Research Institute. 550
1 Scope
Machinery Industry Standard of the People's Republic of China
Powdered Coal for Green Sand Mold Casting
Seacoal for green sand mold
JB/T 9222:1999
Replaces ZB J31002--88
This standard specifies the brand, technical requirements, test methods and inspection rules of powdered coal for green sand mold casting. This standard applies to coal powder for solidified casting of cast iron parts. 2 Referenced standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. Industrial analysis methods of coal
GB/T 212—1991
GB/T 214—1983:
Method for determination of sulfur content in coalbzxZ.net
GB/T2684-1981 Test method for raw sand and mixture for casting
3 Definitions
This standard adopts the following definitions.
3.1 Coal powder for green casting
Coal powder for green casting is a product made from coal as raw material, and its function is to prevent sand sticking and sand inclusion in cast iron parts. 3.2 Bright carbon
Bright carbon is a deposited carbon film formed when carbon-rich materials are thermally decomposed at high temperature. The carbon film is smooth and bright, and is called bright carbon. 4 Brand
Foundry coal powder for wet molds is divided into three brands according to the volatile content: SMF-35SMF-30 and SMF-25. The expression method is as follows: SMF-XX
Lower limit of volatile content in the brand
Chinese phonetic prefix of foundry coal powder for wet molds
5 Technical requirements
The volatile content shall comply with the provisions of Table 1.
SMF-35
SMF-30
SMF-25
Approved by the State Bureau of Machinery Industry on June 24, 1999 Volatile content
>30～35
≥25～30
Implemented on January 1, 2000
5.2 Ash content is not more than 10%.
5.3 Sulfur content is not more than 2%.
5.4 Moisture content is not more than 4%.
JB/T9222.1999
5.5 More than 95% of the particles should pass through a 0.106mm sieve. 5.6 If the purchaser requires control of items not listed in this standard (such as bright carbon, coke slag characteristics, etc.), the supply and demand parties can agree in the agreement.
6 Test methods
6.1 Volatile matter content, ash content, moisture content and coke slag characteristics shall be determined in accordance with GB/T212. 6.2 Sulfur content shall be determined in accordance with GB/T 214.
6.3 Particle size shall be determined in accordance with GB/T2684.
7 Inspection rules
7.1 Each batch of wet mold casting coal powder is 30t, but not less than 1t. 7.2 The sampling of mold casting coal powder shall be selected from one hundredth of the bags in the same batch, but not less than 3 bags, and the sampling from each bag shall not be less than 50g.
7.3 When the supplier supplies each batch of wet mold casting coal powder, the coal powder must be inspected in accordance with the contents specified in this standard, and the inspection results shall be filled in the quality certificate, and the buyer shall accept it accordingly. 7.4 The buyer shall conduct incoming inspection on the quality of coal powder in accordance with the agreement. If there is any discrepancy, it can be re-inspected together with the supplier. If the re-test results are inconsistent with the content of this standard and the provisions of the agreement between the supply and demand parties, arbitration may be conducted by a third party selected by the supply and demand parties. 8 Marking, packaging, transportation and storage
8.1 The packaging of coal powder should be 2-~3 layers, with plastic bags as the inner layer and woven bags as the outer layer. Other packaging agreed upon by the supply and demand parties may also be used.
8.2 The weight of each bag of coal powder is 25kg.
8.3 The packaging bag should be clearly marked, including: name, brand, weight, batch number, and full name of the supplier. 8.4 The transportation process should be protected from rain and burning. 8.5 Coal powder should be stored in a cool and dry place, stacked in rows, and kept ventilated to prevent spontaneous combustion. 552
A1 Measuring device
JB/T9222--1999
Appendix A
(Suggestive Appendix)
Method for determination of bright carbon
A7.1 Quartz tube, quartz glass: The quartz tube and quartz glass are connected in a ground joint form, and the quartz wool is loosely filled in the quartz tube, as shown in Figure A1.
Support rod
Quartz tube, wall thickness 3
Quartz wool
Quartz glass
A1.2 Uffer furnace: With a temperature control device, it can be maintained at 875C ± 5C, and is equipped with a thermocouple and a high temperature gauge. A1.3 Dryer: Its size should be suitable for accommodating the quartz tube. A1.4 Analytical balance: The sensitivity is 0.0002g. A1.5 Bracket: Made of heat-resistant steel plate (see Figure A2), equipped with a quartz tube and placed in a muffle furnace. Its size should not exceed the constant overflow area. Figure A2
Test method
Burn the quartz tube filled with quartz wool to constant weight. Use a balance to weigh 0.1-0.3g of the pre-dried sample, accurate to 0.0002g, and place it in a crucible. Place the support with the quartz tube in a muffle furnace and heat it to 875°C ± 5°C. Then place the crucible on the quartz tube and keep it at 875°C ± 5°C for 3 minutes. Cool the quartz tube and the crucible in a desiccator and weigh the quartz tube and the bright carbon precipitated on the quartz wool. A3 Test Result Calculation
The percentage (%) of bright carbon precipitated is calculated according to formula (A1): AE
Weight of quartz tube after test, B
Wherein: A--
E-Weight of quartz tube before test·g;
D Weight of dried sample, g.
(Ai)
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