Rare earth modifiers: including rare earth modifiers for cast iron and rare earth modifiers for cast steel. It is a rare earth additive based on rare earth elements, optimized and compounded with a variety of other active elements. In the metallurgical manufacturing process of alloy castings, wear-resistant alloy steel, heat-resistant steel, high-speed tool steel and other castings, it has strong deoxidation, desulfurization, degassing, deterioration and microalloying capabilities.

 

1. The brand and chemical composition of rare earth modifiers for YFB-series chromium series white cast iron are shown in Table1:

 

Features:

1. It has a strong ability to purify the grain boundary, reduce the segregation of harmful elements and inclusions at the grain boundary, improve the shape, size and distribution of the inclusions, correspondingly reduce the stress concentration, reduce the source of cracks, and improve the bonding strength of the grain boundary. Reach the role of grain boundary strengthening, thereby improving the strength and toughness of the material, and reducing peeling and wear.

2. Obvious refinement of grains, elimination of coarse columnar crystals and dendrites in the as-cast state, to achieve the effect of grain boundary strengthening, thereby improving the strength and toughness of the material.

3. A variety of active elements rich in the modificator can play a solid solution strengthening role, and can also form high hardness, high strength, fine and dispersed carbides, and metal intergranular compound particles to form a dispersion strengthening effect, thereby improving wear resistance sex.

4. Improve the shape and distribution of carbides, refine and break carbides, from the original network, bone, tend to island, massive, granular distribution, and uniform distribution, reduce the splitting effect of carbides on the matrix , and can promote the heat treatment granulation of eutectic carbide, simplify the heat treatment process and improve the overall performance of the material.

5. Using this modifier, combined with the user's actual smelting and heat treatment process, the impact value of the casting can be increased by more than 20% on average, and the wear resistance can be increased by 20-30% .

                                                       Table 1 Executive Standard: Q/36LY 002—2021

Grade	Chemical   composition   / %				scope of application
	RE	Mg/B/Ti	And	Fe
YFB-1	4～﹤12	Appropriate amount	≤ 45	margin	low alloy cast iron
YFB-2	12～﹤16	Appropriate amount	≤36	margin	Low and medium alloy cast iron
YFB-3	16～﹤20	Appropriate amount	≤ 3 6	margin	Medium and high alloy cast iron

 

 

2. The grade and chemical composition of YBZW-series wear-resistant alloy steel and other rare earth modifiers are shown in Table 2:

 

Features:

1. Rich in various active elements, it can effectively play the role of solid solution strengthening and dispersion strengthening, and can inhibit the precipitation of carbides in the as-cast structure at the grain boundary, thereby greatly improving the mechanical properties and wear resistance of as-cast alloy steel .

2. It has a strong ability to purify molten steel, can effectively purify grain boundaries, eliminate pores, reduce the segregation of non-metallic elements such as H, O, S, and P at grain boundaries, improve the shape, size, and distribution of grain boundary inclusions, and play a role in grain boundaries. The effect of boundary strengthening, thereby improving the plasticity and machinability of steel, and improving the process yield.

3. Obvious refinement of grain and matrix structure, thereby improving the bonding strength of grain boundaries, achieving grain boundary strengthening, and improving the overall performance of the material.

4. Promote the rapid formation of an oxide scale protective film on the surface of the alloy, improve the adhesion of the oxide scale, and prevent the scale from peeling off, thereby improving the heat resistance of the material.

5. Used in high-speed steel or wear-resistant alloy steel to improve the morphology and distribution of carbides, refine and break carbides, uniformly disperse and distribute carbides, reduce the splitting effect of carbides on the matrix, reduce stress concentration, and promote The heat treatment granulation of eutectic carbides reduces the heat treatment process to improve the comprehensive performance of the material.

                                                        table 2

Grade	Chemical   composition   / %				scope of application
	RE	Mg/B/Ti	And	Fe
YBZW-1	9～﹤14	Appropriate amount	≤45	margin	alloy steel
YBZW-2	14～﹤18	Appropriate amount	30～40	margin	low alloy wear resistant steel
YBZW-3	18～﹤21	Appropriate amount	30～40	margin	Medium and high alloy wear-resistant steel
YBZW-4	21～﹤25	Appropriate amount	30～40	margin	Medium and high carbon alloy wear-resistant steel
YBZW- 5	21～﹤25	Appropriate amount	30～40	margin	Stainless steel, high-speed steel, heat-resistant steel

 

 

3. The grade and chemical composition of rare earth modifiers such as WS-series heat-resistant steel and high-speed tool steel are shown in Table 3:

 

Features:   

1. It is produced by a special superimposed combination process, with high purity of the modifier and low silicon content, which expands the application range of the modifier.

2. Improve casting performance, combine trace harmful impurities with low melting point (such as arsenic, lead, antimony, bismuth, tin and other elements are non-metallic inclusions with high melting point), and discharge them into the slag to achieve grain refinement, The role of purification of grain boundaries.

3. High temperature strength, high durable strength, low brittleness, excellent welding performance, and excellent resistance to high temperature oxidation and no peeling. Its service life is 2-10 times higher than that of similar brands. Through process cooperation, the content of nickel and chromium in heat-resistant steel can be saved, thereby greatly reducing production costs.

4. Slow down and hinder the aggregation and growth of carbides, so that the carbides are fine and uniformly distributed in the grain or grain boundary and have a dispersed granular shape, which can refine the grains; through microalloying, the matrix can be strengthened, so the steel can be significantly improved. Excellent thermal hardness, durability and toughness. The heat resistance performance is increased by more than 30% on average, and the casting yield is increased by about 20%.

5. It has good carburizing resistance, excellent high temperature oxidation resistance and good high temperature strength, which improves the inherent brittle weakness of iron-chromium-aluminum alloy, and is easy to weld and cold-form.

                                                         Table 3

Grade	Chemical   composition   / %				scope of application
	AND	And	Al	Fe
WS-1	65～75	<0.5	/	margin	5Cr21Mn9Ni4N and similar grades of heat-resistant steel
WS-2	20～25	<0.5	margin	/	M2 and similar grades of high-speed tool steel

 

 

4. The grade and chemical composition of the rare earth modifier for high manganese steel are shown in Table 4:

 

1. The company has successfully developed a high manganese steel modifier by using local resources. The wear resistance can be increased by more than 20% after using the modifier in combination with a certain process .                                                                                                        Table 4

Grade	Chemical   composition   / %					scope of application
	RE	This/Y	Mg/B/Ti	And	Fe
GM-1	16～24	This	Appropriate amount	≤45	margin	Ordinary high manganese steel
GM-2	16～24	AND	Appropriate amount	≤4 5	margin	Ultra high manganese steel

 

 

Composite deoxidizer products: for electric furnace or converter steelmaking, can eliminate gas, purify molten steel, quickly form white slag, reduce the amount of fluorite, and shorten the smelting time.

 

5. The grade and chemical composition of the compound deoxidizer used in steelmaking are shown in Table 5:

 Table 5 

Grade No.	Chemical   composition (%)						Scope of application
	That	Al	RE	And	active ingredient	Fe
YLG-A1	1～3	1～3	Appropriate amount	40～50	Appropriate amount	margin	Electric Furnace or Converter Steelmaking

 

6. Physical properties:

 

1. The appearance of the product is irregular particles, not pulverized, and the new section is silver gray, without obvious inclusions; WS is in the shape of an ingot, and there is no obvious oxidized powder on the surface; YLG- A 1 is gray powder.

2. The particle size range of the product is 1mm～5mm, 1mm～10mm, 3mm～15mm, 5mm～25mm, and those less than the lower limit and greater than the upper limit shall not exceed 5% of the total mass ; the size of ingot-shaped products shall be negotiated by both parties.

3. If the buyer has other requirements on the chemical composition and specifications (grain size), the supplier and the buyer shall negotiate separately.

 

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