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01-09

2024

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How many molding methods are there for refractory castables

$How many molding methods are there for refractory castables$

01-08

2024

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There are three types of fire-resistant spray coatings according to construction methods

01-08

2024

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The raw materials and usage effects of iron ditch castables

10-29

2020

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How to find a good manufacturer of building materials grouting material

How to find a good manufacturer of building materials grouting material?

10-29

2020

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Yutai high-temperature new material re-trains and learns to create Ruicheng waterless gun mud customers assured products

　　1. Standard for gray iron castings: GB9439-88 　　2. Features of gray cast iron parts: 　　(1) Good abrasion resistance and shock absorption. As the graphite in cast iron is good for lubrication and oil storage, it has good wear resistance. Similarly, due to the presence of graphite, gray cast iron has better shock absorption than steel. 　　(2) Good process performance. Because gray cast iron has high carbon content, close to eutectic composition, low melting point, good fluidity, and small shrinkage, it is suitable for casting complex or thin-walled castings. In addition, because graphite makes it easy to form chip breakage during cutting, the machinability of gray cast iron is better than steel.a 　　The level 0 level 1 flat platform shall have no less than 25 points within a range of 25 mm square on each side. 　　Level 2 flat platform shall have no less than 20 points within a range of 25mm square on each side. 　　Level 3 flat platform shall have no less than 12 points within a range of 25mm square on each side. 　　The working surface of the cast iron platform should not have rust, scratches, bruises and other appearance defects that affect the use. 　　There should be no casting defects such as sand holes, pores, cracks, slag inclusions and shrinkage on the working surface. The surface of various castings should be cleaned of molding sand, and the surface should be smooth and painted firmly. The edges should be blunt. The cast iron platform is allowed to be blocked with the same material for the sand hole with a diameter of less than 15mm on the platform working surface with an accuracy level lower than "00" level, and its hardness should be lower than the hardness of the surrounding materials. There should be no more than four blocks on the working surface, and the distance between them should be no less than 80mm. 　　3. The relationship between hardness and tensile strength: 　　The relationship between the hardness and tensile strength of gray cast iron, the empirical formula is: 　　A, HB=RH(100+0.438σb) when σb≥196N/mm²...…… …(B1) 　　B. When σb<196N/mm², HB=RH(44+0.724σb)...……… (B2) 　　The relative hardness (RH) value in the formula is mainly determined by the raw material, melting process, processing technology and cooling rate of the casting.

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How many molding methods are there for refractory castables

2024-01-09

There are three types of fire-resistant spray coatings according to construction methods

2024-01-08

The raw materials and usage effects of iron ditch castables

2024-01-08

How to find a good manufacturer of building materials grouting material

2020-10-29

How to find a good manufacturer of building materials grouting material?

Yutai high-temperature new material re-trains and learns to create Ruicheng waterless gun mud customers assured products

2020-10-29

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