阅读说明：本技术 一种高性能高镍奥氏体球铁 (High-performance high-nickel austenitic ductile iron ) 是由 魏晋南 戎军 孙全友 吴小雄 华晓斌 蒋德生 李天朋 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种高性能高镍奥氏体球铁,按照重量份数包括如下成分：C：1.5～2.2份、Mn：0.1～0.6份、P：0.01～0.035份、S：0.01～0.02份、Si：5.0～5.2份、Ni：35～36份、Cr：1.80～2.10份、Mo+W：0.01～0.02份、CE：3.8～4.5份、无硅球化剂20～25份。本发明通过创新设计的配方组分与独特的无硅球化剂的配合,使得高镍奥氏体球铁的机械性能得到了均衡性提升,能够同时实现抗拉强度≥450MPa,屈服强度≥205MPa,延伸率≥10％,解决了现有技术存在的三种性能参数存在相互制约,无法同时达标的技术问题,技术瓶颈得到了突破,从而扩大了高镍奥氏体球铁的应用范围,具备极好的市场应用价值。(The invention discloses high-performance high-nickel austenite ductile iron which comprises the following components in parts by weight: c: 1.5-2.2 parts of Mn: 0.1-0.6 parts of P: 0.01-0.035 parts by weight, S: 0.01-0.02 parts of Si: 5.0-5.2 parts of Ni: 35-36 parts of Cr: 1.80-2.10 parts of Mo + W: 0.01-0.02 parts of CE: 3.8-4.5 parts and 20-25 parts of silicon-free nodulizer. According to the invention, through the matching of the innovatively designed formula components and the unique silicon-free nodulizer, the mechanical properties of the high-nickel austenitic ductile iron are improved in a balanced manner, the tensile strength is more than or equal to 450MPa, the yield strength is more than or equal to 205MPa, and the elongation is more than or equal to 10%, so that the technical problems that three performance parameters in the prior art are mutually restricted and cannot reach the standard simultaneously are solved, the technical bottleneck is broken through, the application range of the high-nickel austenitic ductile iron is expanded, and the high-nickel austenitic ductile iron has excellent market application value.)

1. The high-performance high-nickel austenitic ductile iron is characterized by comprising the following components in parts by weight:

c: 1.5-2.2 parts of Mn: 0.1-0.6 parts of P: 0.01-0.035 parts by weight, S: 0.01-0.02 parts of Si: 5.0-5.2 parts of Ni: 35-36 parts of Cr: 1.80-2.10 parts of Mo + W: 0.01-0.02 parts of CE: 3.8-4.5 parts and 20-25 parts of silicon-free nodulizer.

2. The high performance, high nickel austenitic ductile iron of claim 1, wherein the composition of the silicon-free nodulizer comprises magnesium, silicon, calcium, aluminum, and rare earths.

3. The high-performance high-nickel austenitic ductile iron as claimed in claim 1, wherein the silicon-free nodulizer comprises the following components in parts by weight: magnesium: 6-7 parts of silicon: 1-5 parts of calcium: 1.5-2.5 parts of aluminum: 0.1-0.3 parts of rare earth: 10-15 parts.

Technical Field

The invention belongs to the field of material forming and casting, and particularly relates to high-performance high-nickel austenitic ductile iron.

Background

The high-nickel austenite ductile iron with the nickel content of 13-36% is widely applied because the high-nickel austenite ductile iron has good corrosion resistance in natural water, sewage, salt, high-temperature alkali and dilute acid, and has the characteristics of no magnetism, controllable thermal expansion, good low-temperature and high-temperature oxidation resistance and the like.

However, in some special fields, the requirement on the mechanical properties of the high-nickel austenitic ductile iron is high, for example, the tensile strength is more than or equal to 450MPa, the yield strength is more than or equal to 205MPa, and the elongation is more than or equal to 10%, which must be met simultaneously, but the above purpose cannot be achieved no matter how the conventional high-nickel austenitic ductile iron is prepared and improved, so that the application range of the high-nickel austenitic ductile iron is greatly limited, and the market demand cannot be met.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the high-performance high-nickel austenitic ductile iron is provided, the mechanical performance of the high-nickel austenitic ductile iron can be improved in a balanced manner, the use requirements in special fields are met, and the application range of the high-nickel austenitic ductile iron is expanded.

The technical scheme is as follows: in order to achieve the aim, the invention provides high-performance high-nickel austenitic ductile iron which comprises the following components in parts by weight:

c: 1.5-2.2 parts of Mn: 0.1-0.6 parts of P: 0.01-0.035 parts by weight, S: 0.01-0.02 parts of Si: 5.0-5.2 parts of Ni: 35-36 parts of Cr: 1.80-2.10 parts of Mo + W: 0.01-0.02 parts of CE: 3.8-4.5 parts and 20-25 parts of silicon-free nodulizer.

Further, the components of the silicon-free nodulizer comprise magnesium, silicon, calcium, aluminum and rare earth.

Further, the silicon-free nodulizer comprises the following components in parts by weight: magnesium: 6-7 parts of silicon: 1-5 parts of calcium: 1.5-2.5 parts of aluminum: 0.1-0.3 parts of rare earth: 10-15 parts.

Has the advantages that: compared with the prior art, the invention has the following advantages:

1. through the matching of the innovatively designed formula components and the unique silicon-free nodulizer, the mechanical property of the high-nickel austenitic ductile iron is improved in balance, the tensile strength is larger than or equal to 450MPa, the yield strength is larger than or equal to 205MPa, and the elongation is larger than or equal to 10%, the technical problems that three performance parameters in the prior art are mutually restricted and cannot reach the standard simultaneously are solved, the technical bottleneck is broken through, the application range of the high-nickel austenitic ductile iron is expanded, and the high-nickel austenitic ductile iron has excellent market application value.

2. Through the matching of the innovatively designed formula components and the unique silicon-free nodulizer, the nodulizing grade of the high-nickel austenitic ductile iron is improved, the utilization rate of scrap returns is improved, and the casting yield is improved.

Detailed Description

The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.

Example 1:

the embodiment provides high-performance high-nickel austenitic ductile iron which comprises the following components in parts by weight:

c: 1.5 parts, Mn: 0.1 part, P: 0.01 part, S: 0.01 part, Si: 5.0 parts, Ni: 35 parts of Cr: 1.80 parts, Mo + W: 0.01 part, CE: 3.8 parts of silicon-free nodulizer and 20 parts of silicon-free nodulizer;

the silicon-free nodulizer comprises: magnesium (Mg): 6 parts, silicon (Si): 1 part, calcium (Ca): 1.5 parts, aluminum (Al): 0.1 part of Rare Earth (RE): 11.4 parts.

Example 2:

the embodiment provides high-performance high-nickel austenitic ductile iron which comprises the following components in parts by weight:

c: 2.2 parts, Mn: 0.6 part, P: 0.035 parts, S: 0.02 part, Si: 5.2 parts, Ni: 36 parts of Cr: 2.10 parts of Mo + W: 0.02 part, CE: 4.5 parts of silicon-free nodulizer 25 parts;

the silicon-free nodulizer comprises: magnesium (Mg): 7 parts, silicon (Si): 5 parts, calcium (Ca): 2.5 parts, aluminum (Al): 0.3 part of Rare Earth (RE): 10.2 parts.

Example 3:

the embodiment provides high-performance high-nickel austenitic ductile iron which comprises the following components in parts by weight:

c: 2 parts of Mn: 0.3 part, P: 0.02 part, S: 0.015 part, Si: 5.1 parts, Ni: 35.5 parts, Cr: 2 parts of Mo + W: 0.015 parts, CE: 4 parts of silicon-free nodulizer and 23 parts of silicon-free nodulizer;

the silicon-free nodulizer comprises: magnesium (Mg): 6.5 parts, silicon (Si): 3 parts, calcium (Ca): 2 parts, aluminum (Al): 0.2 part of Rare Earth (RE): 11.3 parts.

Example 4:

to verify the practical effects of the nickel-rich austenitic ductile iron of the present invention, the mechanical properties and other properties of the nickel-rich austenitic ductile iron of examples 1-3 were compared with those of the two prior art nickel-rich austenitic ductile irons in the present example, as specified in the following table:

as can be seen from the above table, the high-nickel austenitic ductile iron provided in examples 1-3 can simultaneously satisfy the conditions that the tensile strength is larger than or equal to 450MPa, the yield strength is larger than or equal to 205MPa, and the elongation is larger than or equal to 10%, while the existing products A-C can obviously not be simultaneously satisfied, so that the application of the existing products A-C is limited, and the high-nickel austenitic ductile iron provided in examples 1-3 can be applied to special fields.

In addition, the spheroidization grade of the high-nickel austenitic ductile iron provided by the embodiments 1 to 3 is obviously superior to that of the existing products A to C, the utilization rate of the recycled materials is obviously improved compared with that of the existing products A to C, a certain relation exists between the utilization rate of the recycled materials and the mechanical property, and the improvement of the utilization rate of the recycled materials can drive the improvement of the mechanical property.