China High Chromium Cast Iron Casting Factory

1、What is the High Chromium Cast Iron Casting?

High chromium cast iron is the abbreviation of high chromium white cast iron, which is a wear-resistant material with excellent performance and is particularly valued. It has much higher wear resistance than alloy steel, and much higher toughness and strength than ordinary white cast iron. At the same time, it also has good high temperature resistance and corrosion resistance. In addition, it is easy to produce and has moderate cost, so it is known as one of the best anti-abrasive wear materials in contemporary times. High chromium cast iron generally refers to alloy white cast iron with a Cr content of 11-30% and a C content of 2.0-3.6%.

2. Performance characteristics of high chromium cast iron

1) Wear resistance of high chromium cast iron

High chromium cast iron has excellent wear resistance and is an excellent friction material. It can be widely used in the manufacture of mechanical parts, ships, oil fields and drilling and other fields. Its excellent wear resistance is mainly due to the large amount of chromium carbides in the internal microstructure. These carbides have high hardness and high impact toughness, and can effectively resist wear and corrosion. Corrosion resistance of high chromium cast iron

2) Another important feature of high chromium cast iron is its excellent corrosion resistance.

It has excellent resistance to a variety of strong acids, strong alkalis and chloride ions, and is widely used in some chemical, petroleum and other fields. This is because the chromium element inside the high chromium cast iron can form a dense chromium oxide protective film, which effectively avoids the invasion of corrosive media.

3) High temperature performance of high chromium cast iron

High chromium cast iron also has outstanding high temperature performance. It can maintain high hardness and strength for a long time at high temperature without obvious softening, embrittlement and other phenomena. The microstructure of the chromium element changes at high temperature, forming a relatively complete chromium oxide protective film, which effectively protects the performance of the material.

Brand	As cast or stress relieved	Hardened or stress relieved	Softened Degenerate State	HRC	HBW	HRC	HBW	HRC	HBW
KmTBCr12				≥46	≥450	256	2600	s41	s400
KmTBCr15Mo				246	2450	258	2650	≤41	≤400
KmTBCr20Mo				≥46	≥450	258	2650	s41	s400
KmTBCr26				≥46	≥450	256	2600	s41	s400

3、Chemical composition of high chromium cast iron

Table: Grade and chemical composition of high chromium cast iron (%)
Brand	C	Mn	Si	Ni	Cr	Mo	Cu	P	S
KmTBCr12	2.0-3.3	≤2.0	s1.5	s2.5	11.0-14.0	≤3.0	≤1.2	=0.10	≤0.06
KmTBCr15Mo	2.0-3.3	≤2.0	512	52.5	11.0-18.0	≤3.0	≤1.2	=0.10	≤0.06
KmTBCr20Mo	2.0-3.3	≤2.0	512	52.5	18.0-23.0	≤3.0	≤1.2	=0.10	≤0.06
KmTBCr26	2.0-3.3	≤2.0	s1.2	s2.5	23.0-30.0	s3.0	s1.2	=0.10	≤0.06

4. Comparison of Chinese and foreign high chromium cast iron grades

No.	China GB	Germany		France NF	ISO	Japan JIS	Russia TOCT	Sweden SS14	U.K. BS	USA
No.	China GB	DIN	W-Nr	France NF	ISO	Japan JIS	Russia TOCT	Sweden SS14	U.K. BS	ASTM	UNS
	KmTBNi4Cr2-DT	G-X260NiCr42	0.9620	FBNi4Cr2BC					Grade 2A	I B Ni-Cr-LC	F45001
2	KmTBNi4Cr2-GT	G-X330NiCr42	0.9625	FBNiCr2HC					Grade 2A	IA Ni-Cr-HC	F45000
3	KmTBCr9Ni5Si2	G-X300CrNiSi952	0.9630	FBCr9Ni5					Grade 2D Grade 2E	I D Ni-HiCr	F45003
4	KmTBCr15Mo2Cul	G-X300CrMo153	0.9635						Grade3B	IC 15%Cr-Mo-HC	F45006
5		G-X300CrMoNi15.21	0.0964	FBCr15MoNi					Grade 3A		F45005
6	KmTBCr20Mo2Cul	G-X260CrMoNi2021	0.9645	FBCr20MoNi	—				Grade 3D	ID20%Cr-Mo-LC	F45007 F45008
7	KmTBCr26	G-X300Cr27 -G-X300CrMo271	0.9650	~FBCr26MoNi		—				Ⅲ A25%Cr	F45009

5. Application fields of high chromium cast iron

1) It is widely used in mining, cement, electricity, road construction machinery, refractory materials, etc., and is commonly used in lining plates, hammer heads, and grinding ball materials. After the 1980s, it was more widely used in the production of shot blasting machine chambers and shot blasting machine blades and lining plates, which can effectively prevent high-speed and dense projectile beams from penetrating steel plate shells.

2) In agricultural machinery, high chromium cast iron materials can be used to produce agricultural machinery plowshares, etc.

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