CN111363972A - Production method of weathering resistant steel Q355NHD - Google Patents
Production method of weathering resistant steel Q355NHD Download PDFInfo
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- CN111363972A CN111363972A CN201811587434.0A CN201811587434A CN111363972A CN 111363972 A CN111363972 A CN 111363972A CN 201811587434 A CN201811587434 A CN 201811587434A CN 111363972 A CN111363972 A CN 111363972A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a production method of weathering steel Q355NHD, (1) steel making control: 1) controlling smelting components; 2) pretreating molten iron: lime powder or Mg + CaO is added into the steel ladle for mechanical stirring pretreatment, desulfurization and slag skimming; 3) tapping time is more than or equal to 4 min; (2) refining: refining in an LF furnace, ensuring micro-positive pressure in a ladle in the refining process, ensuring a reducing atmosphere and an inert protective atmosphere, and ensuring that white slag can be tapped in more than 10 minutes by a refining furnace; (3) controlling a continuous casting process; (4) managing a continuous casting blank; (5) controlling a steel rolling process; (6) and (3) finishing process: and naturally cooling the rolled steel plate. The invention optimizes the process, reduces the internal defect rate of the weathering steel Q355NHD continuous casting billet and the steel plate to a lower level, eliminates corner cracks and improves the quality of the weathering steel Q355NHD continuous casting billet and the steel plate.
Description
Technical Field
The invention belongs to a production method of weathering steel Q355NHD of steel enterprises, in particular to a production method of weathering steel Q355 NHD.
Background
The weathering steel, namely the atmospheric corrosion resistant steel, is low alloy steel between ordinary steel and stainless steel, the weathering steel is made of plain carbon steel with a small amount of corrosion resistant elements such as copper, nickel, etc., and has the characteristics of high-quality steel such as obdurability, ductility, molding, welding and cutting, abrasion, high temperature, fatigue resistance, etc.; the weather resistance is 2-8 times of that of the plain carbon steel, and the coating property is 1.5-10 times of that of the plain carbon steel. Meanwhile, it has the characteristics of rust resistance, corrosion resistance, long service life, thinning, consumption reduction, labor saving, energy saving and the like.
Analysis of causes of internal defects of the weathering steel Q355NHD continuous casting billet:
(1) corner cracks. After the lower opening of the crystallizer is seriously worn, a larger air gap is generated between a copper pipe of the crystallizer and a casting blank to form larger thermal resistance, so that the cooling of the lower opening is too weak, the blank shell is thinned, meanwhile, the zero-section corner is excessively cooled due to the serious wear of the lower opening, the cooling gradient from weak to strong is too large, stress concentration is generated, and corner cracks are easily generated due to the fact that the thickness of the blank shell is uneven and the casting blank is transformed.
(2) Center porosity and general porosity. The looseness at the axial center of the steel ingot is called central looseness. When molten steel solidifies and contracts in the ingot mold, if the upper unset molten steel cannot be effectively replenished to the lower portion, the structure of the central portion is not dense. The columnar crystal direction centers on the two surfaces of the casting blank are grown and contacted together to form a bridge, the supplement of the solidification shrinkage of the molten steel above the bridge to the molten steel below the bridge is prevented, and a plurality of small pores are left after the molten steel below the bridge is completely solidified. In addition, the developed columnar crystal grows with developed dendrites, and some fine dendrites (such as cubic dendrites) are partially melted and collapsed, and also form a central porosity.
The general distribution of porosity in the cross section of the casting blank is called general porosity, which is small point gaps uniformly distributed in the cross section of the casting blank. The main reason for this is that the steel contains too much gas and non-metallic inclusions or the casting speed is too fast, and the key is to do full degassing and reduction deoxidation work and good casting operation during steel making.
In a harsh service environment of the weathering steel, the weathering steel has the problems that a rust layer is difficult to densify, and in addition, the appearance corrosion of a steel structure is uneven in the initial service stage, so the application environment and the surface treatment technology of the weathering steel always disturb the application of the weathering steel.
Disclosure of Invention
The invention aims to provide a production method of weathering steel Q355NHD, which optimizes the process, reduces the internal defect rate of the weathering steel Q355NHD continuous casting billet and the steel plate to a lower level, eliminates corner cracks, and improves the quality of the weathering steel Q355NHD continuous casting billet and the steel plate.
The purpose of the invention is realized as follows: a production method of weathering steel Q355NHD comprises the following steps:
(1) controlling steel making: 1) controlling smelting components: 0.075-0.095% of C, 0.20-0.30% of Si, 0.95-1.15% of Mn, 0-0.020% of P, 0-0.006% of S, 0.26-0.35% of Cu, 0.15-0.25% of Ni, 0.42-0.55% of Cr, 0.020-0.040% of Al, 0.020-0.03% of Ti0.0015-0.004% of Ca;
2) pretreating molten iron: lime powder or Mg + CaO is added into the steel ladle for mechanical stirring pretreatment, desulfurization and slag skimming;
3) tapping time is more than or equal to 4min, slag is blocked, red ladle tapping is carried out, and the thickness of a slag layer is controlled within 50 mm;
(2) refining: refining in an LF furnace, ensuring micro-positive pressure in a ladle in the refining process, ensuring a reducing atmosphere and an inert protective atmosphere, and ensuring that white slag can be tapped in more than 10 minutes by a refining furnace;
(3) controlling a continuous casting process: liquidus temperature: 1524 ℃, solid phase temperature: 1475 ℃, TD superheat degree of 30 ℃, TD minimum molten steel amount (pouring by changing a tundish): 5 tons, the maximum pulling speed is 1.2 m/min;
(4) performing continuous casting blank management, namely performing common air cooling on a continuous casting blank, wherein the cold storage time is longer than 36 hours, cleaning the continuous casting blank to ensure that a plate blank is free of defects, and the internal quality of the continuous casting blank requires that C-type segregation is less than or equal to 1.5 and internal cracking is less than or equal to 0.5; A. the B, C, D type inclusions are not more than 2 grades respectively;
(5) controlling a steel rolling process: the thickness of the continuous casting billet is 220mm, the heating temperature of a heating furnace is 1000-1290 ℃, the heating speed is 8.5min/cm, and 8 steel blocks are produced in hours; the starting temperature is 1070 ℃ and 1110 ℃, and the finishing temperature is 850 +/-25 ℃;
(6) and (3) finishing process: naturally cooling the rolled steel plate in air, and not watering and cooling.
The heating temperature of the continuous casting blank is divided into 1050 +/-50 ℃ of the first heating section, 1260 +/-30 ℃ of the second heating section and 1240 +/-20 ℃ of the soaking section.
The invention has the following effects:
by adopting the measures, the internal quality of the weathering steel Q355NHD continuous casting billet is greatly improved, and the low-power inspection result of the continuous casting billet shows that corner cracks are basically eliminated, the central shrinkage cavity is 0.5-1.0 grade, and the central porosity is 1.0-1.5 grade.
The invention has the following application range and application prospect:
the method is suitable for the same type of steel rolling enterprises, analyzes the internal quality problem of the weathering steel Q355NHD continuous casting billet caused by the problems of secondary cooling process and continuous casting equipment, adopts the measures of optimizing process and improving equipment, reduces the internal defect rate of the weathering steel Q355NHD continuous casting billet and the steel plate to a lower level, and improves the quality of the weathering steel Q355NHD continuous casting billet and the steel plate.
The invention optimizes the process, reduces the internal defect rate of the weathering steel Q355NHD continuous casting billet and the steel plate to a lower level, eliminates corner cracks and improves the quality of the weathering steel Q355NHD continuous casting billet and the steel plate.
Detailed Description
Example 1
A production method of weathering steel Q355NHD comprises the following steps:
pretreatment of molten iron, 120t of converter, LF refining, continuous casting, heating, controlled rolling, finishing, flaw detection and warehousing.
1. Controlling steel making:
1.1 smelting component control: see table 1.
Table 1: principal component control requirement
1.2, molten iron pretreatment: lime powder or Mg + CaO is added into the steel ladle to carry out mechanical stirring pre-desulfurization treatment, and slag skimming treatment is carried out after desulfurization is finished;
1.3, tapping for a target time t of more than or equal to 4min, strictly blocking slag, tapping in a red ladle, and ensuring that the thickness of a slag layer is controlled within 50 mm;
2. refining:
the LF furnace is used for removing impurities, adjusting components, controlling temperature, ensuring micro-positive pressure in a ladle in a refining process, and ensuring a reducing atmosphere and an inert protective atmosphere. The refining furnace must ensure that the white slag can be tapped for more than 10 minutes.
3. Controlling a continuous casting process:
(1) the mold flux is special mold flux for weathering steel, and the model of the mold flux is determined according to the components;
(2) liquidus temperature: 1524 deg.C; solid phase temperature: 1475 ℃; TD superheat degree of 30 ℃;
(3) TD minimum molten steel amount (pouring by changing a tundish): 5 tons of the catalyst;
(4) the maximum pulling speed is 1.2 m/min;
(5) continuous casting reference of different steel grades: and continuous casting is not carried out. The number of the furnaces for continuous casting of one tundish is not more than 12;
4. continuous casting billet management:
(1) casting blank cooling reference: ordinary air cooling is carried out, and the storage cooling time is longer than 36 hours;
(2) casting blank cleaning reference: and (6) flame cleaning the abnormal blank. Carefully checking by naked eyes, and performing edge part gun pulling, chamfering and peeling process cleaning if necessary to ensure that the plate blank is free of defects;
(3) casting blank internal quality sampling reference: sampling TOP sides of a first plate blank in a first furnace and a second plate blank in a fourth furnace in the same steel type and CAST;
(4) the requirement of the casting blank internal quality (the slab defect sulfur print rating is carried out according to the metallurgical standard YB/T4003-1997):
the segregation of C is less than or equal to 1.5, and the internal crack is less than or equal to 0.5; A. each of the B, C, D-type inclusions is not more than 2-grade
5. Controlling a steel rolling process:
5.1 Process parameters of the furnace are shown in Table 2.
TABLE 2
5.2 Rolling temperature parameters are shown in Table 3.
TABLE 3
| Thickness of finished product | The start rolling temperature is DEG C | Target thickness to be heated | Temperature of waiting for temperature | The final rolling temperature is DEG C |
| 8～25 | 1070～1110 | ≥1.5T | ≤980℃ | 850±25 |
6. And (3) finishing process: naturally cooling the rolled steel plate in air, and not watering and cooling.
Claims (2)
1. A production method of weathering steel Q355NHD is characterized by comprising the following steps:
(1) controlling steel making: 1) controlling smelting components: 0.075-0.095% of C, 0.20-0.30% of Si, 0.95-1.15% of Mn, 0-0.020% of P, 0-0.006% of S, 0.26-0.35% of Cu, 0.15-0.25% of Ni, 0.42-0.55% of Cr, 0.020-0.040% of Al, 0.020-0.03% of Ti0.0015-0.004% of Ca;
2) pretreating molten iron: lime powder or Mg + CaO is added into the steel ladle for mechanical stirring pretreatment, desulfurization and slag skimming;
3) tapping time is more than or equal to 4min, slag is blocked, red ladle tapping is carried out, and the thickness of a slag layer is controlled within 50 mm;
(2) refining: refining in an LF furnace, ensuring micro-positive pressure in a ladle in the refining process, ensuring a reducing atmosphere and an inert protective atmosphere, and ensuring that white slag can be tapped in more than 10 minutes by a refining furnace;
(3) controlling a continuous casting process: liquidus temperature: 1524 ℃, solid phase temperature: 1475 ℃, TD superheat degree of 30 ℃, TD minimum molten steel amount (pouring by changing a tundish): 5 tons, the maximum pulling speed is 1.2 m/min;
(4) performing continuous casting blank management, namely performing common air cooling on a continuous casting blank, wherein the cold storage time is longer than 36 hours, cleaning the continuous casting blank to ensure that a plate blank is free of defects, and the internal quality of the continuous casting blank requires that C-type segregation is less than or equal to 1.5 and internal cracking is less than or equal to 0.5; A. the B, C, D type inclusions are not more than 2 grades respectively;
(5) controlling a steel rolling process: the thickness of the continuous casting billet is 220mm, the heating temperature of a heating furnace is 1000-1290 ℃, the heating speed is 8.5min/cm, and 8 steel blocks are produced in hours; the starting temperature is 1070 ℃ and 1110 ℃, and the finishing temperature is 850 +/-25 ℃;
(6) and (3) finishing process: naturally cooling the rolled steel plate in air, and not watering and cooling.
2. The method for producing weathering steel Q355NHD according to claim 1, wherein: the heating temperature of the continuous casting blank is divided into 1050 +/-50 ℃ of the first heating section, 1260 +/-30 ℃ of the second heating section and 1240 +/-20 ℃ of the soaking section.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112095050A (en) * | 2020-10-09 | 2020-12-18 | 新疆八一钢铁股份有限公司 | Production method of low-alloy high-strength structural steel |
| CN114535523A (en) * | 2022-03-20 | 2022-05-27 | 新疆八一钢铁股份有限公司 | Production method of weathering resistant steel Q355NHD casting blank |
| CN116179965A (en) * | 2022-11-25 | 2023-05-30 | 重庆钢铁股份有限公司 | Economical weather-resistant structural steel plate Q355NHD and manufacturing method thereof |
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| CN112095050A (en) * | 2020-10-09 | 2020-12-18 | 新疆八一钢铁股份有限公司 | Production method of low-alloy high-strength structural steel |
| CN112095050B (en) * | 2020-10-09 | 2021-08-27 | 新疆八一钢铁股份有限公司 | Production method of low-alloy high-strength structural steel |
| CN114535523A (en) * | 2022-03-20 | 2022-05-27 | 新疆八一钢铁股份有限公司 | Production method of weathering resistant steel Q355NHD casting blank |
| CN116179965A (en) * | 2022-11-25 | 2023-05-30 | 重庆钢铁股份有限公司 | Economical weather-resistant structural steel plate Q355NHD and manufacturing method thereof |
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Application publication date: 20200703 |