WO2018103082A1 - Heat-treated steel alloy - Google Patents

Abstract

A heat-treated steel alloy, comprising the following raw materials in percentage by weight: C: 1.2％-1.5％; Al: 0.12％-0.16％; Mo: 0.008％-0.018％; Mn: 0.5％-1.0％; B: 0.5％-1.2％; Ni: 0.1％-1.4％; Si: 3.55％-4.15％; Ti: 0.004％-0.01％; V: 0.1％-4.2％; W: 0.005％-0.01％; Cr: 0.5％-4.2％; Nb: 0.05％-0.15％; Re: 0.05％-0.16％; Be: 0％-0.24％; and the balance Fe. A preparation method for the heat-treated steel alloy comprises the following steps: S1, weighting raw materials in percentage by parts, and adding the raw materials into a smelting furnace in sequence at a smelting temperature of 1000-1600ºC for 4-6 min to obtain a blank; and S2, performing heat treatment on the blank, the technological parameters of the heat treatment being heating the blank to a temperature of 250-350ºC at a heating rate of 100ºC/h, and then heating same to a temperature of 1050-1150ºC at a heating rate of 120ºC/h.

Description

Heat treated steel alloy Technical field

The invention relates to the technical field of steel materials, in particular to a heat-treated steel alloy.

Background technique

Steel alloys have a history of more than 100 years. The use of alloy steel in the industry is about the second half of the 19th century. At that time, due to the increasing production and use of steel, the machinery manufacturing industry needed to solve the problem of steel machining and cutting. In 1868, the Britishman Mahit invented self-hardening steel with a composition of 2.5% Mn-7%W, which improved the cutting speed. To 5 m / min. With the development of commerce and transportation, in 1870, a bridge spanning 158.5 meters was built on the Mississippi River with chrome steel (1.5-2.0% Cr) in the United States; due to difficulties in processing components, some industrial countries switched to nickel later. Steel (3.5% Ni) builds long span bridges. At the same time, some countries have also used nickel steel for the construction of warships. With the development of engineering technology, it is required to speed up the rotation speed of the machine. In 1901, high carbon chromium rolling bearing steel appeared in Western Europe. In 1910, the 18W-4Cr-1V high-speed tool steel was developed to further increase the cutting speed to 30 m/min. It can be seen that the advent and development of alloy steel is adapted to the requirements of the development of social productive forces, especially the needs of machinery manufacturing, transportation and military industry. The existing steel alloy has insufficient strength, low forgeability, no good durability, and mechanical properties to be improved. For this reason, we propose a heat-treated steel alloy.

Summary of the invention

Based on the technical problems existing in the background art, the present invention proposes a heat-treated steel alloy.

A heat-treated steel alloy proposed by the present invention comprises the following weight percentages of raw materials:

C: 1.2% - 1.5%; Al: 0.12% - 0.16%; Mo: 0.008% - 0.018%; Mn: 0.5% - 1.0%; B: 0.5% - 1.2%; Ni: 0.1% - 1.4%; 3.55%-4.15%; Ti: 0.004%-0.01%; V: 0.1%-4.2%; W: 0.005%-0.01%; Cr: 0.5%-4.2%; Nb: 0.05%-0.15%; Re: 0.05% -0.16%; Be: 0% - 0.24%; the balance is Fe.

Preferably, the following weight percentages of raw materials are included:

C: 1.3% - 1.4%; Al: 0.13% - 0.15%; Mo: 0.009% - 0.017%; Mn: 0.7% - 0.8%; B: 0.7% - 1.0%; Ni: 0.6% - 0.9%; 3.8%-4.0%; Ti: 0.006%-0.008%; V: 0.8%-3.5%; W: 0.007%-0.009%; Cr: 0.8%-3.6%; Nb: 0.07%-0.13%; Re: 0.08% -0.13%; Be: 0.12% - 0.18%; the balance is Fe.

Preferably, the following weight percentages of raw materials are included:

C: 1.35%; Al: 0.14%; Mo: 0.013%; Mn: 0.75%; B: 0.85%; Ni: 0.8%; Si: 3.9%; Ti: 0.007%; V: 2.5%; W: 0.008%; Cr: 2.2%; Nb: 0.11%; Re: 0.11%; Be: 0.15%; balance: Fe.

Preferably, the method for preparing the steel alloy comprises the following steps:

S1, raw material C is weighed according to the percentage by weight: 1.2%-1.5%; Al: 0.12%-0.16%; Mo: 0.008%-0.018%; Mn: 0.5%-1.0%; B: 0.5%-1.2%; Ni: 0.1%-1.4%; Si: 3.55%-4.15%; Ti: 0.004%-0.01%; V: 0.1%-4.2%; W: 0.005%-0.01%; Cr: 0.5%-4.2%; Nb: 0.05% -0.15%; Re: 0.05% - 0.16%; Be: 0% - 0.24%; the balance is Fe; the above raw materials are sequentially added to the melting furnace, the melting temperature is 1000-1600 ° C, for 4-6 min, Obtaining a billet;

S2, heat treatment of the billet, the heat treatment process parameters are: heating at a heating rate of 100 ° C / h to a temperature of 250-350 ° C, and then heating at a heating rate of 120 ° C / h to 1050-1150 ° C, holding time 3-5h , the transformation temperature is 550-650 ° C, the holding time is 10-15 min, to obtain a preform;

S3, the preform in S2 is kept at a temperature of 200-300 ° C for 1-2 h, air-cooled to obtain a finished product, and the finished product is inspected and packaged into a warehouse.

Preferably, in the S2, the billet is subjected to heat treatment, and the process parameters of the heat treatment are: heating at a heating rate of 100 ° C / h to a temperature of 300 ° C, and then heating to a temperature of 120 ° C / h to 1100 ° C, after the holding time of 4 h The conversion temperature was 600 ° C and the holding time was 12 min to obtain a preform.

In the present invention, by rationally selecting the chemical elements of the steel alloy, the combination ratio of each element is optimized, and in combination with the selection of chemical elements, when the steel alloy is prepared, the billet is first obtained by smelting, and heat treatment is performed to optimize the heat treatment process. Related parameters make the alloy structure performance enhanced, its strength and forgeability increased, and good durability. The distribution ratio of the invention is reasonable, the preparation process is simple, and the prepared steel alloy has good comprehensive performance and durability. Suitable for promotion.

detailed description

The invention is further illustrated below in conjunction with specific embodiments.

Embodiment 1

A heat-treated steel alloy proposed by the present invention comprises the following weight percentages of raw materials:

C: 1.2%; Al: 0.12%; Mo: 0.008%; Mn: 0.5%; B: 0.5%; Ni: 0.1%; Si: 3.55%; Ti: 0.004%; V: 0.1%; W: 0.005%; Cr: 0.5%; Nb: 0.05%; Re: 0.05%;

The preparation method comprises the following steps:

S1, the raw materials are weighed according to the percentage by weight, and the raw materials are sequentially added to the melting furnace, and the melting temperature is 1000 ° C for 4 min to obtain a billet;

S2, heat treatment of the billet, the process parameters of the heat treatment are: heating at a heating rate of 100 ° C / h to a temperature of 250 ° C, and then heating to a temperature of 120 ° C / h to 1050 ° C, holding time of 3 h, the transition temperature is 550 ° C , the holding time is 10min, and the pre-product is obtained;

S3, the preform in S2 is kept at a temperature of 200 ° C for 1 h, air-cooled to obtain a finished product, and the finished product is inspected and packaged into a warehouse.

Embodiment 2

A heat-treated steel alloy proposed by the present invention comprises the following weight percentages of raw materials:

C: 1.3%; Al: 0.13%; Mo: 0.009%; Mn: 0.7%; B: 0.7%; Ni: 0.6%; Si: 3.8%; Ti: 0.006%; V: 0.8%; W: 0.007%; Cr: 0.8%; Nb: 0.07%; Re: 0.08%; Be: 0.12%; balance is Fe.

The preparation method comprises the following steps:

S1, the raw materials are weighed according to the percentage by weight, and the raw materials are sequentially added to the melting furnace, and the melting temperature is 1100 ° C for 4.5 min to obtain a billet;

S2, heat treatment of the billet, the process parameters of the heat treatment are: heating at a heating rate of 100 ° C / h to a temperature of 275 ° C, and then heating to a temperature of 120 ° C / h to 1075 ° C, holding time of 3.5 h, the transition temperature is 575 °C, holding time 11min, to obtain the preform;

S3, the preform in S2 is kept at a temperature of 225 ° C for 1.2 h, and air-cooled to obtain The finished product is packed into the warehouse.

Embodiment 3

A heat-treated steel alloy proposed by the present invention comprises the following weight percentages of raw materials:

C: 1.35%; Al: 0.14%; Mo: 0.013%; Mn: 0.75%; B: 0.85%; Ni: 0.8%; Si: 3.9%; Ti: 0.007%; V: 2.5%; W: 0.008%; Cr: 2.2%; Nb: 0.11%; Re: 0.11%; Be: 0.15%; balance: Fe.

The preparation method comprises the following steps:

S1, the raw materials are weighed according to the percentage by weight, and the raw materials are sequentially added to the melting furnace, and the melting temperature is 1300 ° C for 5 min to obtain a billet;

S2, heat treatment of the billet, the process parameters of the heat treatment are: heating at a heating rate of 100 ° C / h to a temperature of 300 ° C, and then heating to a temperature of 120 ° C / h to 1100 ° C, after the holding time of 4 h, the transition temperature is 600 ° C , the holding time is 14min, and the pre-product is obtained;

S3, the preform in S2 is kept at a temperature of 250 ° C for 1.5 h, air-cooled to obtain a finished product, and the finished product is inspected and packaged into a warehouse.

Embodiment 4

A heat-treated steel alloy proposed by the present invention comprises the following weight percentages of raw materials:

C: 1.4%; Al: 0.15%; Mo: 0.017%; Mn: 0.8%; B: 1.0%; Ni: 0.9%; Si: 4.0%; Ti: 0.008%; V: 3.5%; W: 0.009%; Cr: 3.6%; Nb: 0.13%; Re: 0.13%; Be: 0.18%; balance is Fe.

The preparation method comprises the following steps:

S1, the raw materials are weighed according to the percentage by weight, and the raw materials are sequentially added to the melting furnace, and the melting temperature is 1500 ° C for 5.5 min to obtain a billet;

S2, heat treatment of the billet, the process parameters of the heat treatment are: heating at a heating rate of 100 ° C / h to a temperature of 325 ° C, and then heating to a temperature of 120 ° C / h to 1125 ° C, holding time of 4.5 h, the transition temperature is 625 °C, holding time 14min, to obtain the preform;

S3, the preform in S2 is kept at a temperature of 280 ° C for 1.8 h, air-cooled to obtain a finished product, and the finished product is inspected and packaged into a warehouse.

Embodiment 5

A heat-treated steel alloy proposed by the present invention comprises the following weight percentages of raw materials:

C: 1.5%; Al: 0.16%; Mo: 0.018%; Mn: 1.0%; B: 1.2%; Ni: 1.4%; Si: 4.15%; Ti: 0.01%; V: 4.2%; W: 0.01%; Cr: 4.2%; Nb: 0.15%; Re: 0.16%; Be: 0.24%; balance is Fe.

The preparation method comprises the following steps:

S1, the raw materials are weighed according to the percentage by weight, and the raw materials are sequentially added to the melting furnace, and the melting temperature is 1600 ° C for 6 min to obtain a billet;

S2, heat treatment of the billet, the heat treatment process parameters are: heating at a heating rate of 100 ° C / h to a temperature of 350 ° C, and then heating at a heating rate of 120 ° C / h to 1150 ° C, after 5 h holding time, the transition temperature is 650 ° C , the holding time is 15min, and the pre-product is obtained;

S3, the preform in S2 is kept at a temperature of 300 ° C for 2 h, air-cooled to obtain a finished product, and the finished product is inspected and packaged into a warehouse.

In Examples 1-5, the mechanical properties of the obtained steel alloys were tested and the results are as follows:

Tensile strength (MPa) Elongation rate (%) Embodiment 1 1373 19 Embodiment 2 1391 17 Embodiment 3 1421 twenty one

Embodiment 4 1375 19 Embodiment 5 1385 18

As can be seen from the above table, the steel alloy of the present invention has excellent tensile strength and elongation, and has high overall performance.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any technical person skilled in the art within the technical scope disclosed by the present invention, the technical solution according to the present invention Equivalent substitutions or modifications of the inventive concept are intended to be included within the scope of the invention.

Claims (5)

A heat-treated steel alloy characterized by comprising the following weight percentages of raw materials: C: 1.2% - 1.5%; Al: 0.12% - 0.16%; Mo: 0.008% - 0.018%; Mn: 0.5% - 1.0%; B: 0.5% - 1.2%; Ni: 0.1% - 1.4%; 3.55%-4.15%; Ti: 0.004%-0.01%; V: 0.1%-4.2%; W: 0.005%-0.01%; Cr: 0.5%-4.2%; Nb: 0.05%-0.15%; Re: 0.05% -0.16%; Be: 0% - 0.24%; the balance is Fe. A heat-treated steel alloy according to claim 1, comprising the following raw materials by weight: C: 1.3% - 1.4%; Al: 0.13% - 0.15%; Mo: 0.009% - 0.017%; Mn: 0.7% - 0.8%; B: 0.7% - 1.0%; Ni: 0.6% - 0.9%; 3.8%-4.0%; Ti: 0.006%-0.008%; V: 0.8%-3.5%; W: 0.007%-0.009%; Cr: 0.8%-3.6%; Nb: 0.07%-0.13%; Re: 0.08% -0.13%; Be: 0.12% - 0.18%; the balance is Fe. A heat-treated steel alloy according to claim 1, comprising the following raw materials by weight: C: 1.35%; Al: 0.14%; Mo: 0.013%; Mn: 0.75%; B: 0.85%; Ni: 0.8%; Si: 3.9%; Ti: 0.007%; V: 2.5%; W: 0.008%; Cr: 2.2%; Nb: 0.11%; Re: 0.11%; Be: 0.15%; balance: Fe. A heat-treated steel alloy according to claim 1, wherein the method for preparing the steel alloy comprises the following steps: S1, the raw material C is weighed according to the percentage by weight: 1.2%-1.5%; Al: 0.12% -0.16%; Mo: 0.008% - 0.018%; Mn: 0.5% - 1.0%; B: 0.5% - 1.2%; Ni: 0.1% - 1.4%; Si: 3.55% - 4.15%; Ti: 0.004% - 0.01 %; V: 0.1% - 4.2%; W: 0.005% - 0.01%; Cr: 0.5% - 4.2%; Nb: 0.05% - 0.15%; Re: 0.05% - 0.16%; Be: 0% - 0.24%; The balance is Fe; the above raw materials are sequentially added to the smelting furnace, and the smelting temperature is 1000-1600 ° C for 4-6 min to obtain a billet; S2, heat treatment of the billet, the heat treatment process parameters are: heating at a heating rate of 100 ° C / h to a temperature of 250-350 ° C, and then heating at a heating rate of 120 ° C / h to 1050-1150 ° C, holding time 3-5h , the transformation temperature is 550-650 ° C, the holding time is 10-15 min, to obtain a preform; S3, the preform in S2 is kept at a temperature of 200-300 ° C for 1-2 h, air-cooled to obtain a finished product, and the finished product is inspected and packaged into a warehouse. The heat-treated steel alloy according to claim 1 or 4, wherein in the S2, the billet is subjected to heat treatment, and the process parameters of the heat treatment are: heating at a temperature rising rate of 100 ° C / h to a temperature of 300 ° C, and then After heating at a heating rate of 120 ° C / h to 1100 ° C, holding time of 4 h, the transition temperature was 600 ° C, holding time 12 min, to obtain a preform.