CN105803171A - Heat treatment process for low-alloy high-strength structural steel forge piece after forging - Google Patents
Heat treatment process for low-alloy high-strength structural steel forge piece after forging Download PDFInfo
- Publication number
- CN105803171A CN105803171A CN201610319902.0A CN201610319902A CN105803171A CN 105803171 A CN105803171 A CN 105803171A CN 201610319902 A CN201610319902 A CN 201610319902A CN 105803171 A CN105803171 A CN 105803171A
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- China
- Prior art keywords
- forging
- steel
- low
- alloy high
- forge piece
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
Abstract
The invention discloses a heat treatment process for a low-alloy high-strength structural steel forge piece after forging. The heat treatment process includes the following steps that a, forging forming is performed, wherein low-alloy high-strength structural steel serves as raw materials, the raw materials are forged to obtain the steel forge piece, the initial forging temperature is 1150 DEG C to 1180 DEG C, and the final forging temperature is 870 DEG C to 915 DEG C; b, waste heat normalizing is performed, wherein by controlling the final forging temperature, the final forging temperature of the steel forge piece is equal to Ac3 of the steel grade material or is higher than Acm of the steel grade material by 30 DEG C to 50 DEG C, and after forging forming, direct air cooling is performed; c, rough machining is performed, wherein rough machining is performed on the cooled steel forge piece till the designed size is achieved; and d, finish machining is performed, wherein finish machining is performed on the steel forge piece subjected to rough machining till the precision requirement is met. According to the heat treatment process for the low-alloy high-strength structural steel forge piece after forging, normalizing is directly performed through forging waste heat, heat-preserving time is saved, energy is saved, the production period is shortened, the tensile strength of the produced low-alloy high-strength structural steel forge piece can be improved by 5-10%, the extension rate can be increased by 50%, the impact resistance can be improved by 70%, and the rest of indexes all meet standard requirements.
Description
Technical field
The present invention relates to a kind of Technology for Heating Processing, particularly relate to the forging of a kind of low-alloy high-tensile structural steel forging
After-baking technique.
Background technology
At present, the normative heat treatment technique of low-alloy high-tensile structural steel forging is all to be cooled to room temperature at forging
After, then reheated by technological procedure and carry out heat treatment, its whole technological process is the most numerous and diverse, produces
Cycle is longer, and until low-alloy high-tensile structural steel forging cool down after again by technological procedure reheated into
Row heat treatment, significantly increases energy resource consumption, thus, is badly in need of solving.
Summary of the invention
It is an object of the invention to provide the heat treatment after forging technique of a kind of low-alloy high-tensile structural steel forging,
Big, production cycle length to solve the Technology for Heating Processing energy resource consumption of existing low-alloy high-tensile structural steel forging
Shortcoming.
It is an object of the invention to be achieved through the following technical solutions:
The heat treatment after forging technique of a kind of low-alloy high-tensile structural steel forging, comprises the following steps:
A, forging and molding: employing low-alloy high-tensile structural steel is raw material, obtain steel forgings by raw material forging,
Wherein, initial forging temperature is 1150～1180 DEG C, and final forging temperature is 870～915 DEG C；
B, afterheat normalizing: by controlling final forging temperature, make the final forging temperature of steel forgings equal to this steel grade material
Ac3 or more than Acm 30～50 DEG C, after forging and molding, Direct Air-Cooled；
C, roughing: the steel forgings after cooling is carried out roughing to the size designed；
D, polish: the steel forgings after roughing is refined to required precision.
As a preferred embodiment of the present invention, in described step a, initial forging temperature is 1165 DEG C.
As a preferred embodiment of the present invention, in described step a, final forging temperature is 890 DEG C.
The invention have the benefit that the heat treatment after forging work of described a kind of low-alloy high-tensile structural steel forging
Skill utilizes residual forging heat directly to carry out normalizing, not only eliminates temperature retention time, has saved the energy, shortens life
The product cycle, and the low-alloy high-tensile structural steel forging tensile strength produced can improve 5%-10%, elongation percentage
Can improve 50%, shock resistance can improve 70%, and remaining index all reaches standard-required.
Detailed description of the invention
Technical scheme is further illustrated below by detailed description of the invention.It is understood that
Embodiment described herein is used only for explaining the present invention, rather than limitation of the invention.
Embodiment 1
In the present embodiment, the heat treatment after forging technique of a kind of low-alloy high-tensile structural steel forging, including with
Lower step:
A, forging and molding: employing low-alloy high-tensile structural steel is raw material, obtain steel forgings by raw material forging,
Wherein, initial forging temperature is 1150 DEG C, and final forging temperature is 870 DEG C；
B, afterheat normalizing: by controlling final forging temperature, make the final forging temperature of steel forgings equal to this steel grade material
Ac3 or more than Acm 30～50 DEG C, after forging and molding, Direct Air-Cooled；
C, roughing: the steel forgings after cooling is carried out roughing to the size designed；
D, polish: the steel forgings after roughing is refined to required precision.
Embodiment 2
In the present embodiment, the heat treatment after forging technique of a kind of low-alloy high-tensile structural steel forging, including with
Lower step:
A, forging and molding: employing low-alloy high-tensile structural steel is raw material, obtain steel forgings by raw material forging,
Wherein, initial forging temperature is 1180 DEG C, and final forging temperature is 915 DEG C；
B, afterheat normalizing: by controlling final forging temperature, make the final forging temperature of steel forgings equal to this steel grade material
Ac3 or more than Acm 30～50 DEG C, after forging and molding, Direct Air-Cooled；
C, roughing: the steel forgings after cooling is carried out roughing to the size designed；
D, polish: the steel forgings after roughing is refined to required precision.
Embodiment 3
In the present embodiment, the heat treatment after forging technique of a kind of low-alloy high-tensile structural steel forging, including with
Lower step:
A, forging and molding: employing low-alloy high-tensile structural steel is raw material, obtain steel forgings by raw material forging,
Wherein, initial forging temperature is 1165 DEG C, and final forging temperature is 890 DEG C；
B, afterheat normalizing: by controlling final forging temperature, make the final forging temperature of steel forgings equal to this steel grade material
Ac3 or more than Acm 30～50 DEG C, after forging and molding, Direct Air-Cooled；
C, roughing: the steel forgings after cooling is carried out roughing to the size designed；
D, polish: the steel forgings after roughing is refined to required precision.
The present embodiment is the preferred embodiment of the present invention, high by the low-alloy using said method to produce
Strength structure steel forgings, after tested, tensile strength can improve 5%～10%, and elongation percentage can improve 50%, impact
Can improve 70%, remaining index all reaches standard-required.
Above example simply elaborates ultimate principle and the characteristic of the present invention, and the present invention is not by above-described embodiment
Limiting, without departing from the spirit and scope of the present invention, the present invention also has various change and change, this
A little changes and change both fall within scope of the claimed invention.Claimed scope is by appended
Claims and equivalent thereof define.
Claims (3)
1. the heat treatment after forging technique of a low-alloy high-tensile structural steel forging, it is characterised in that: include with
Lower step:
A, forging and molding: employing low-alloy high-tensile structural steel is raw material, obtain steel forgings by raw material forging,
Wherein, initial forging temperature is 1150～1180 DEG C, and final forging temperature is 870～915 DEG C；
B, afterheat normalizing: by controlling final forging temperature, make the final forging temperature of steel forgings equal to this steel grade material
Ac3 or more than Acm 30～50 DEG C, after forging and molding, Direct Air-Cooled；
C, roughing: the steel forgings after cooling is carried out roughing to the size designed；
D, polish: the steel forgings after roughing is refined to required precision.
The heat treatment after forging work of a kind of low-alloy high-tensile structural steel forging the most according to claim 1
Skill, it is characterised in that: in described step a, initial forging temperature is 1165 DEG C.
The heat treatment after forging work of a kind of low-alloy high-tensile structural steel forging the most according to claim 1
Skill, it is characterised in that: in described step a, final forging temperature is 890 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610319902.0A CN105803171A (en) | 2016-05-13 | 2016-05-13 | Heat treatment process for low-alloy high-strength structural steel forge piece after forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610319902.0A CN105803171A (en) | 2016-05-13 | 2016-05-13 | Heat treatment process for low-alloy high-strength structural steel forge piece after forging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105803171A true CN105803171A (en) | 2016-07-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610319902.0A Pending CN105803171A (en) | 2016-05-13 | 2016-05-13 | Heat treatment process for low-alloy high-strength structural steel forge piece after forging |
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| Country | Link |
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| CN (1) | CN105803171A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115740314A (en) * | 2022-11-24 | 2023-03-07 | 南京工程学院 | Anti-cracking and energy-saving forging process for high-strength large-scale forging |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1478916A (en) * | 2003-04-30 | 2004-03-03 | 贵州工业大学 | Mn-Re series high malleability air-cooled bainitic steel and its manufacturing process |
| CN1916195A (en) * | 2006-08-29 | 2007-02-21 | 武汉大学 | Method for producing ultra high temperature bainitic steel in ultralow carbon |
| CN101302601A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof |
| CN102230134A (en) * | 2011-07-01 | 2011-11-02 | 南京钢铁股份有限公司 | Quaternary marine mooring chain steel with large specification and high performance and machining process thereof |
| CN105112624A (en) * | 2015-09-24 | 2015-12-02 | 无锡宝露重工有限公司 | Heat treatment process of steel forgings |
-
2016
- 2016-05-13 CN CN201610319902.0A patent/CN105803171A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1478916A (en) * | 2003-04-30 | 2004-03-03 | 贵州工业大学 | Mn-Re series high malleability air-cooled bainitic steel and its manufacturing process |
| CN1916195A (en) * | 2006-08-29 | 2007-02-21 | 武汉大学 | Method for producing ultra high temperature bainitic steel in ultralow carbon |
| CN101302601A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof |
| CN102230134A (en) * | 2011-07-01 | 2011-11-02 | 南京钢铁股份有限公司 | Quaternary marine mooring chain steel with large specification and high performance and machining process thereof |
| CN105112624A (en) * | 2015-09-24 | 2015-12-02 | 无锡宝露重工有限公司 | Heat treatment process of steel forgings |
Non-Patent Citations (1)
| Title |
|---|
| 闫洪 等: "《锻造工艺与模具设计》", 31 January 2012 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115740314A (en) * | 2022-11-24 | 2023-03-07 | 南京工程学院 | Anti-cracking and energy-saving forging process for high-strength large-scale forging |
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Application publication date: 20160727 |
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