CN111534752A - Production method for improving surface hardness of 303F stainless steel bar - Google Patents
Production method for improving surface hardness of 303F stainless steel bar Download PDFInfo
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- CN111534752A CN111534752A CN202010437878.7A CN202010437878A CN111534752A CN 111534752 A CN111534752 A CN 111534752A CN 202010437878 A CN202010437878 A CN 202010437878A CN 111534752 A CN111534752 A CN 111534752A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention relates to a production method for improving the surface hardness of a 303F stainless steel bar, which comprises the following steps: firstly, customizing 303F stainless steel material with a specific component proportion, putting a stainless steel coiled material on a sand blasting drawing production line, performing sand blasting rust removal treatment and involucra treatment, and then putting the stainless steel coiled material into a drawing machine for drawing, wherein the drawing reduction ratio is 10-25%; and (3) straightening for the second time after drawing is finished, wherein the deviation degree of the central line of the bar and the axial plane where the axes of the upper convex roller and the lower concave roller of the double-roller high-precision straightening machine are located is less than or equal to 1mm, adjustable handles are additionally arranged on two sides of the double-roller high-precision straightening machine respectively to apply radial pressure on the same diameter to the bar, the surface temperature of the bar is 55 +/-2 ℃, and finally chamfering is carried out by adopting a chamfering machine to obtain a finished product. The production method of the invention adds the adjustable handle to assist the straightening of the bar, so that the central axis of the bar is reduced in deviation and force is applied on four sides, and the speed of the bar passing through the straightening machine and the outlet temperature are controlled, thereby improving the surface hardness of the product by more than 10%.
Description
The technical field is as follows:
the invention relates to the technical field of metal material processing, in particular to a production method for improving the surface hardness of a 303F stainless steel bar.
Background art:
the 303F stainless steel is a common widely-used stainless steel material, and generally, the stainless steel bar is produced with high efficiency by adopting a drawing production process. However, the common production process generally only comprises the steps of uncoiling, pre-straightening, sand blasting and rust removing, drawing, cutting, fine straightening, chamfering and the like, and the 303F stainless steel bar produced by the common method is difficult to reach a higher standard in product hardness and meet special requirements in occasions, and the problems of mold damage, surface scratch and the like easily occur in the drawing process of the existing process.
The invention content is as follows:
the invention aims to overcome the defects of the existing products and provides a production method for improving the surface hardness of 303F stainless steel bars.
The technical scheme adopted by the invention is as follows: a production method for improving the surface hardness of a 303F stainless steel bar comprises the following steps:
firstly, a 303F stainless steel material with specific component proportion is customized, and the component proportion in the 303F stainless steel material is as follows: c: 0.06% -0.08%, Si: 0.8% -0.9%, Mn: 1.8% -2%, S: 0.15% -0.25%, Ni: 9.2% -9.4%, Cr: 18.5 to 18.7 percent of Fe, and the balance of Fe; producing 303F stainless steel coiled material according to the proportion of the components;
putting a stainless steel coiled material on a sand blasting drawing production line, placing the stainless steel coiled material on a material tray for uncoiling, primarily straightening the stainless steel coiled material by a traction and pre-straightening machine, and then sending the stainless steel coiled material into an automatic shot blasting machine for sand blasting and rust removing;
the wire subjected to sand blasting and rust removal treatment is subjected to surface coating agent soaking through a container filled with the coating agent, then a layer of dense porous membrane is formed on the surface of the wire after drying through a dryer, and then the wire enters a drawing machine for drawing, wherein the drawing reduction rate (namely the difference between the cross section area of the wire before drawing and the cross section area of the wire after drawing divided by the cross section area of the wire before drawing is 100%) is 10-25%;
and after drawing, cutting the bar into fixed length by using a fixed length cutting machine, carrying out secondary straightening by using a double-roller high-precision straightening machine, wherein in the secondary straightening, the deviation degree of the central axis surface of the central line of the bar and the axes of an upper convex roller and a lower concave roller of the double-roller high-precision straightening machine is less than or equal to 1mm, adjustable handles are respectively additionally arranged on two sides of the double-roller high-precision straightening machine, the inner end surface of each adjustable handle is abutted against two sides of the bar, radial pressure on the same diameter is applied to the bar and is vertical to the central axis surface, meanwhile, the running speed of the bar passing through the double-roller high-precision straightening machine is controlled, the surface temperature of the bar is 55 +/-2 ℃ after the bar leaves the double-roller high-precision straightening.
In the production method, the coating agent adopts one or more of sodium chloride, lime or anhydrous sodium sulphate as the components.
The production method comprises the steps of firstly adopting or customizing 303F stainless steel materials in a specific proportion, performing sand skin and leather film treatment before drawing to enable the wires to adsorb more lubricating oil, drawing more smoothly and reducing the damage of a die and the surface scratches of a product, after drawing according to a certain reduction ratio, adding an adjustable handle in a double-roller high-precision straightening machine to assist in straightening the rods, reducing the deflection of the central axes of the rods and applying force on four sides, and simultaneously controlling the speed and the outlet temperature of the rods passing through the straightening machine to improve the surface hardness of the product, wherein the HRC hardness value of the surface of the 303F stainless steel rods produced by the process can be stabilized between 30 and 33, while the HRC hardness values of the surface of the 303F stainless steel rods produced by the common process are below 27, so that the surface hardness of the product is improved by more than 10 percent by the process.
Description of the drawings:
FIG. 1 is a schematic diagram of the secondary straightening step in the present invention.
The specific implementation mode is as follows:
the invention is further illustrated below with reference to specific embodiments and the accompanying drawings.
The first embodiment is as follows:
firstly, a 303F stainless steel material with specific component proportion is customized, and the component proportion in the 303F stainless steel material is as follows: c: 0.06%, Si: 0.8%, Mn: 1.8%, S: 0.15%, Ni: 9.2%, Cr: 18.5 percent and the balance of Fe; producing 303F stainless steel coiled material according to the proportion of the components;
putting a stainless steel coiled material on a sand blasting drawing production line, placing the stainless steel coiled material on a material tray for uncoiling, primarily straightening the stainless steel coiled material by a traction and pre-straightening machine, and then sending the stainless steel coiled material into an automatic shot blasting machine for sand blasting and rust removing;
the wire subjected to sand blasting and rust removal treatment is soaked with a coating agent on the surface of the wire through a container filled with the coating agent, the coating agent is a sodium chloride and lime mixture solution, a layer of dense porous membrane is formed on the surface of the wire after drying through a dryer, the wire enters a drawing machine for drawing, and the surface reduction rate of drawing (namely the difference between the cross section area of the wire before drawing and the cross section area of the wire after drawing divided by the cross section area of the wire before drawing x 100%) is 10%;
after drawing, cutting the bar material into fixed length by using a fixed length cutting machine, performing secondary straightening by using a double-roller high-precision straightening machine, wherein in the secondary straightening, as shown in a combined drawing of fig. 1, the deviation degree of the central axis of the central line of the bar material a and the central axis of the axes of an upper convex roller 1 and a lower concave roller 2 of the double-roller high-precision straightening machine is less than or equal to 1mm, adjusting handles 3 are respectively added on two sides of the double-roller high-precision straightening machine, the inner end surfaces of the adjusting handles 3 are abutted against two sides of the bar material a, radial pressure on the same diameter is applied to the bar material, the inner end surfaces of the adjusting handles are perpendicular to the central axis, meanwhile, the running speed of the bar material a through the double-roller high-precision straightening machine is controlled to be about 3 m/s.
Example two:
firstly, a 303F stainless steel material with specific component proportion is customized, and the component proportion in the 303F stainless steel material is as follows: c: 0.07%, Si: 0.85%, Mn: 1.88%, S: 0.20%, Ni: 9.3%, Cr: 18.6 percent and the balance of Fe; producing 303F stainless steel coiled material according to the proportion of the components;
putting a stainless steel coiled material on a sand blasting drawing production line, placing the stainless steel coiled material on a material tray for uncoiling, primarily straightening the stainless steel coiled material by a traction and pre-straightening machine, and then sending the stainless steel coiled material into an automatic shot blasting machine for sand blasting and rust removing;
the wire subjected to sand blasting and rust removing treatment is subjected to surface infiltration of a coating agent by a container filled with the coating agent, the coating agent is a sodium sulfate solution, a layer of dense porous membrane is formed on the surface of the wire after drying by a dryer, the wire enters a drawing machine for drawing, and the drawing reduction rate (namely the difference between the cross section area of the wire before drawing and the cross section area of the wire after drawing is divided by the cross section area of the wire before drawing, namely 100%) is 18%;
after drawing, cutting the bar material into fixed length by using a fixed length cutting machine, performing secondary straightening by using a double-roller high-precision straightening machine, wherein in the secondary straightening, as shown in a combined drawing of fig. 1, the deviation degree of the central axis of the central line of the bar material a and the central axis of the axes of an upper convex roller 1 and a lower concave roller 2 of the double-roller high-precision straightening machine is less than or equal to 1mm, adjusting handles 3 are respectively added on two sides of the double-roller high-precision straightening machine, the inner end surfaces of the adjusting handles 3 are abutted against two sides of the bar material a, radial pressure on the same diameter is applied to the bar material, the inner end surfaces are perpendicular to the central axis, meanwhile, the running speed of the bar material a through the double-roller high-precision straightening machine is controlled to be about 2.5 m/s, the surface temperature of.
Example three:
firstly, a 303F stainless steel material with specific component proportion is customized, and the component proportion in the 303F stainless steel material is as follows: c: 0.08%, Si: 0.9%, Mn: 2%, S: 0.25%, Ni: 9.4%, Cr: 18.7 percent and the balance of Fe; producing 303F stainless steel coiled material according to the proportion of the components;
putting a stainless steel coiled material on a sand blasting drawing production line, placing the stainless steel coiled material on a material tray for uncoiling, primarily straightening the stainless steel coiled material by a traction and pre-straightening machine, and then sending the stainless steel coiled material into an automatic shot blasting machine for sand blasting and rust removing;
the wire rod after the sand blasting rust removal treatment is soaked with a coating agent on the surface of the wire rod through a container filled with the coating agent, the coating agent is a mixture solution of anhydrous sodium sulphate and lime, a layer of dense porous membrane is formed on the surface of the wire rod after the drying of the coating agent by a dryer, the wire rod enters a drawing machine for drawing, and the reduction ratio of drawing (namely the difference between the cross section area of the wire rod before drawing and the cross section area of the wire rod after drawing is divided by the cross section area of the wire rod before drawing: 100%) is 25%;
after drawing, cutting the bar material into fixed length by using a fixed length cutting machine, performing secondary straightening by using a double-roller high-precision straightening machine, wherein in the secondary straightening, as shown in a combined drawing of fig. 1, the deviation degree of the central axis of the central line of the bar material a and the central axis of the axes of the upper convex roller 1 and the lower concave roller 2 of the double-roller high-precision straightening machine is less than or equal to 1mm, adjusting handles 3 are respectively added on two sides of the double-roller high-precision straightening machine, the inner end surfaces of the adjusting handles 3 are abutted against two sides of the bar material a, radial pressure on the same diameter is applied to the bar material, the inner end surfaces of the adjusting handles are perpendicular to the central axis, meanwhile, the running speed of the bar material a through the double-roller high-precision straightening machine is controlled to be about 2 m/s.
| Process for the preparation of a coating | Hardness of | Hardness characteristics |
| Conventional production process | HRC27 or less | Wave motion |
| The production process of the invention | HRC30-33 | Stabilization |
Therefore, the production method of the invention firstly adopts or customizes 303F stainless steel material with specific proportion, after sand skin and film treatment is carried out before drawing, the wire can absorb more lubricating oil, drawing is smoother, the damage of a die and the surface scratch of a product are reduced, after drawing is carried out according to a certain reduction ratio, an adjustable handle is added in a double-roller high-precision straightening machine to assist the straightening of the bar, the central axis of the bar is reduced and offset and force is exerted on four sides, and simultaneously the speed and the outlet temperature of the bar passing through the straightening machine are controlled, so that the surface hardness of the product is improved.
Claims (2)
1. A production method for improving the surface hardness of 303F stainless steel bars is characterized by comprising the following steps: the production method comprises the following steps:
firstly, a 303F stainless steel material with specific component proportion is customized, and the component proportion in the 303F stainless steel material is as follows: c: 0.06% -0.08%, Si: 0.8% -0.9%, Mn: 1.8% -2%, S: 0.15% -0.25%, Ni: 9.2% -9.4%, Cr: 18.5 to 18.7 percent of Fe, and the balance of Fe; producing 303F stainless steel coiled material according to the proportion of the components;
putting a stainless steel coiled material on a sand blasting drawing production line, placing the stainless steel coiled material on a material tray for uncoiling, primarily straightening the stainless steel coiled material by a traction and pre-straightening machine, and then sending the stainless steel coiled material into an automatic shot blasting machine for sand blasting and rust removing;
the wire subjected to sand blasting and rust removal treatment is soaked with a coating agent on the surface of the wire through a container filled with the coating agent, then a layer of compact porous membrane is formed on the surface of the wire after the wire is dried through a dryer, and then the wire is drawn in a drawing machine, wherein the reduction rate of drawing is 10% -25%;
and after drawing, cutting the bar into fixed length by using a fixed length cutting machine, carrying out secondary straightening by using a double-roller high-precision straightening machine, wherein in the secondary straightening, the deviation degree of the central axis surface of the central line of the bar and the axes of an upper convex roller and a lower concave roller of the double-roller high-precision straightening machine is less than or equal to 1mm, adjustable handles are respectively additionally arranged on two sides of the double-roller high-precision straightening machine, the inner end surface of each adjustable handle is abutted against two sides of the bar, radial pressure on the same diameter is applied to the bar and is vertical to the central axis surface, meanwhile, the running speed of the bar passing through the double-roller high-precision straightening machine is controlled, the surface temperature of the bar is 55 +/-2 ℃ after the bar leaves the double-roller high-precision straightening.
2. The production method for improving the surface hardness of the 303F stainless steel bar material according to claim 1, wherein the production method comprises the following steps: in the production method, the coating agent adopts one or more of sodium chloride, lime or anhydrous sodium sulphate as the components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010437878.7A CN111534752A (en) | 2020-05-21 | 2020-05-21 | Production method for improving surface hardness of 303F stainless steel bar |
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| CN202010437878.7A CN111534752A (en) | 2020-05-21 | 2020-05-21 | Production method for improving surface hardness of 303F stainless steel bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113522997A (en) * | 2021-06-09 | 2021-10-22 | 江苏南钢通恒特材科技有限公司 | High-strength high-precision rust-resistant sulfur-containing free-cutting steel bar cold drawing production process |
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2020
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Cited By (1)
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| CN113522997A (en) * | 2021-06-09 | 2021-10-22 | 江苏南钢通恒特材科技有限公司 | High-strength high-precision rust-resistant sulfur-containing free-cutting steel bar cold drawing production process |
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Application publication date: 20200814 |