CN110144526B - Hot-rolled steel sheet pile and production method thereof - Google Patents
Hot-rolled steel sheet pile and production method thereof Download PDFInfo
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- CN110144526B CN110144526B CN201910559462.XA CN201910559462A CN110144526B CN 110144526 B CN110144526 B CN 110144526B CN 201910559462 A CN201910559462 A CN 201910559462A CN 110144526 B CN110144526 B CN 110144526B
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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
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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
- 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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Abstract
The invention discloses a hot-rolled steel sheet pile, which comprises the following chemical components in percentage by weight: 0.21-0.50% of C, less than or equal to 0.17% of Si, 0.7-0.99% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, and the balance of Fe and inevitable impurities. The method adjusts the effective components in the molten steel, increases the use amount of carbon, reduces the use amounts of manganese, silicon, phosphorus and sulfur, reasonably matches various chemical components in the molten steel, and ensures that the mechanical property of the hot-rolled steel sheet pile meets the requirement of each grade of mechanical property required by the GB/T20993-2014 standard while greatly reducing the production cost under the condition of not adding niobium-vanadium-titanium alloy.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a hot-rolled steel sheet pile and a production method thereof.
Background
The steel sheet pile is a section steel with a locking notch, the section of the steel sheet pile has a straight plate shape, a U shape, a Z shape and the like, and the steel sheet pile is a necessity for hydraulic engineering construction, cofferdam construction, tunnel construction, roadbed engineering and bridge foundation engineering. The steel sheet pile has the following advantages: high quality (high strength, light weight, good water barrier); the construction is simple, the construction period is short, and the construction cost is low; the durability is good, and the service life is 20-50 years; the steel sheet pile can be used without being restricted by weather conditions, and the complex procedure for checking the material or system performance can be simplified in the process of using the steel sheet pile; the interchangeability is good, the material can be repeatedly used for 3 to 5 times, and can be recycled, so that the capital is saved; the construction has obvious environment-friendly effect, greatly reduces the soil sampling amount and the consumption of concrete, and effectively protects land resources; the timeliness of disaster relief and emergency rescue is stronger, such as flood control, collapse, sand drift and the like.
The practical value of the steel sheet pile is reflected in the innovation and the manufacture of a plurality of new products, such as: some special welded buildings; a metal plate made by a hydraulic vibration pile driver; the development of specialized sealing and overprinting processes is a good example of this. Such as the HOESCH patent system, its emergence has opened up a new field where steel sheet piles are important in controlling pollution. Steel sheet piles have been used as vertical sealed retaining walls to protect contaminated land and have been found to meet all of the requirements for water leakage and contamination prevention. The advantages of steel sheet piles as retaining walls are also gradually being widely used in other fields.
The steel sheet pile is difficult to adopt a cold rolling process due to special shape, and the steel sheet pile is difficult to industrialize on a large scale due to special shape of a steel sheet pile locking notch and the like during welding, the need of flaw detection during welding, the problem of welding quality of the steel sheet pile and the like. At present, hot rolled steel sheet piles are mainly used in China, the hot rolled steel sheet piles implement the national standard GB/T20933-2014, and the main specifications comprise 3Z-shaped steel sheet piles, 4 linear steel sheet piles and 16U-shaped steel sheet piles, and the total number of products is 23. The main brands are: Q295P, Q345P, Q390P, Q420P, Q460P. The chemical compositions of each brand specified by the national standards are as follows:
chemical compositions (melting analysis) specified in GB/T20933-:
note 1: the carbon equivalent is calculated by the formula of CEV ═ C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15
The mechanical properties of the steel sheet pile specified by the national standard are shown in the following table:
carbon: is the most important component in steel, and an increase in the amount of carbon increases the amount of pearlite in steel, which increases 50% FATT. In order to increase the toughness of the material during production, the carbon content is therefore reduced within the permitted composition range of the steel grade, and the resulting strength reduction is compensated by an increase in the manganese content of the composition.
Manganese: is an important alloying element. Manganese can expand an austenite phase region, so that the A4 point is increased, and the A3 point is decreased. Since the temperature of A3 is lowered, proeutectoid ferrite is precipitated at a lower temperature and refined. Also, manganese is a main alloying element in low temperature steel because precipitation of carbides at supercooled austenite grain boundaries is suppressed due to a drop in a3 temperature, higher plasticity of steel is maintained, and the ductile-brittle transition temperature of steel is lowered.
Silicon: is the main additive element in the low alloy steel in China. Silicon is solid-dissolved in ferrite without forming carbide in steel, has strong solid-solution strengthening effect, and only exceeds other elements next to carbon, nitrogen and phosphorus, thereby remarkably improving the strength and hardness of the steel, reducing the toughness of the steel and improving the brittle transition temperature.
Phosphorus: are harmful impurities in steel. Since the segregation tends to be severe, it may cause a hazard in a relatively small content state. Phosphorus is very detrimental to the low temperature properties of steel and iron materials and is currently widely recognized as the major cause of low temperature brittleness of steel. The segregation tendency of phosphorus in steel is relatively serious, which causes banded structure and causes uneven mechanical properties of steel, and particularly, the phosphorus content of low-temperature steel, marine steel and hydrogen-induced crack resistant steel is required to be less than 0.01 percent or 0.005 percent.
Sulphur is a harmful impurity in most steel grades (except free-cutting steels). The segregation coefficient of sulfur in steel is largest among all elements, and if segregated at grain boundaries, low-temperature intergranular fracture and high-temperature embrittlement are caused. The increase of the inclusion particles is easy to cause inclusion cracks, so that the process performance and the service performance are damaged. For aviation steel, oil and gas transmission pipeline steel, offshore oil platform steel, etc., the sulfur content must be strictly controlled to ensure necessary toughness.
Niobium, vanadium, titanium: at present, microalloy elements which are used in a large amount in a hot-rolled steel sheet pile mainly have an action mechanism of forming carbide and nitride or carbon nitrogen compound in steel besides a grain refining strengthening effect, and play roles of inhibiting grain growth and generating precipitation strengthening by utilizing a dissolution and precipitation mechanism generated under different conditions. The three elements are added in the production of the hot-rolled steel sheet pile, on one hand, under the condition that the nitrogen and oxygen content in molten steel is higher or ferrovanadium nitride is added, nitride is easily and directly produced to generate stress cracks, so that waste products are easily caused in production, and the nitride has internal stress in qualified products, so that serious potential hazard is brought to subsequent use; on the other hand, the price of niobium, vanadium and titanium alloy is high in China at present, so that the price of the steel sheet pile produced by alloying niobium, vanadium and titanium is high; and rare niobium, vanadium and titanium alloy resources are used for producing the common hot-rolled steel sheet pile, so that the resource waste is great. Therefore, the hot-rolled steel sheet pile without adding niobium, vanadium and titanium is the key for solving the technical problems.
Disclosure of Invention
In view of the above prior art, it is an object of the present invention to provide a hot rolled steel sheet pile and a method for producing the same. The method adjusts the effective components in the molten steel, increases the use amount of carbon, reduces the use amounts of manganese, silicon, phosphorus and sulfur, reasonably matches various chemical components in the molten steel, greatly reduces the production cost under the condition of not adding niobium-vanadium-titanium alloy, and ensures that the mechanical property of the hot-rolled steel sheet pile meets the requirement of each grade of mechanical property required by GB/T20993-2014 standard.
The invention takes carbon and manganese elements as main performance enhancing elements to improve the content of the carbon element and reasonably configure the manganese element to achieve certain carbon equivalent CEV to realize the performance requirements of different grades; by controlling and reducing the contents of silicon, phosphorus and sulfur elements, the purity and continuity of the steel are ensured, and the extensibility of the steel is effectively ensured. The production process mode of adding vanadium, niobium and titanium elements to refine the grain strengthening and the carbonitride two-phase particle strengthening is changed.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a hot-rolled steel sheet pile, which comprises the following chemical components in percentage by weight: 0.21-0.50% of C, less than or equal to 0.17% of Si, 0.7-0.99% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, and the balance of Fe and inevitable impurities.
Preferably, the steel comprises the following chemical components in percentage by weight: 0.29-0.50% of C, 0.09-0.17% of Si, 0.7-0.96% of Mn, 0.015-0.025% of P, 0.010-0.020% of S, and the balance of Fe and inevitable impurities.
In a second aspect of the present invention, there is provided a method for producing the above hot-rolled steel sheet pile, comprising the steps of:
(1) smelting in a converter or an electric furnace;
(2) refining in a refining furnace;
(3) continuous casting and blank drawing;
(4) heating a steel billet;
(5) and hot rolling to obtain a steel sheet pile finished product.
Preferably, in the step (1), the tapping temperature of smelting is controlled to be 1600-1660 ℃ during smelting.
Preferably, in the step (2), the slag alkalinity is controlled to be more than 3.0 during refining in the refining furnace.
Preferably, in the step (3), the tundish temperature of the continuous casting machine is 1480-.
Preferably, in the step (4), the temperature of the steel rolling heating furnace is 1210-1300 ℃ when the steel billet is heated.
Preferably, in the step (5), the hot rolling includes cogging rolling and universal continuous rolling.
Preferably, the temperature is not lower than 1110 ℃ during cogging rolling, and the steel is subjected to reciprocating rolling for 7 times by a cogging mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 940 ℃, and the finish rolling temperature is 820-950 ℃.
The third aspect of the invention provides the application of the hot-rolled steel sheet pile in seepage-proofing and water-stopping engineering and structural foundation engineering. The seepage-proofing and water-stopping engineering comprises an embankment reinforcing and intercepting cofferdam, and the structural foundation engineering comprises a retaining wall, a retaining wall and a building foundation pit support.
The invention has the beneficial effects that:
(1) the method adjusts the effective components in the molten steel, increases the use amount of carbon, reduces the use amounts of manganese, silicon, phosphorus and sulfur, reasonably matches various chemical components in the molten steel, and ensures that the mechanical property of the hot-rolled steel sheet pile meets the requirement of each grade of mechanical property required by the GB/T20993-2014 standard while greatly reducing the production cost under the condition of not adding niobium-vanadium-titanium alloy.
(2) The invention reasonably controls the chemical components of the hot-rolled steel sheet pile steel product, adopts a brand-new chemical component system and a collaborative production method, takes the smelting chemical components as a control target, accurately controls the contents of the main components of carbon, silicon, manganese, phosphorus and sulfur in the hot-rolled steel sheet pile finished product steel, ensures that the mechanical property and the internal structure meet the use requirement of the steel sheet pile, achieves the mechanical property requirement of the hot-rolled steel sheet piles of different brands, and ensures the normal use of the steel sheet pile by the excellent steel property.
(3) The hot-rolled steel sheet pile product produced by the method has the structure and the mechanical property meeting the requirements of products of various brands in the GB/T20993-2014 standard, belongs to a low-cost high-efficiency product, effectively fills the blank of domestic and foreign markets, greatly reduces the production cost of the steel sheet pile, saves rare alloy resources, has obvious effects of reducing the cost, saving resources, being beneficial to environmental protection, strengthening circular economy and the like, and has great significance for the development of national economy.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background section, in the preparation of the hot-rolled steel sheet pile, niobium, vanadium and titanium can inhibit the growth of crystal grains and generate precipitation strengthening action by utilizing the dissolution and precipitation mechanisms generated under different conditions, but under the condition that the nitrogen and oxygen content in molten steel is higher or ferrovanadium nitride is added, nitride is easily and directly produced to generate stress cracks, and meanwhile, the niobium, vanadium and titanium alloy has high price and high production cost. Therefore, it is particularly needed to develop a hot-rolled steel sheet pile without adding niobium, vanadium and titanium and a production method thereof.
Based on the above, the invention aims to provide a hot-rolled steel sheet pile and a production method thereof, which increase the use amount of carbon and reduce the use amounts of manganese, silicon, phosphorus and sulfur by adjusting effective components in molten steel, reasonably collocate various chemical components in the molten steel, and ensure that the mechanical property of the hot-rolled steel sheet pile meets the requirement of each grade of mechanical property required by GB/T20993-.
Example 1: preparation of hot-rolled steel sheet pile with mark Q295P
The steel comprises the following chemical components in percentage by weight: 0.30% of C, 0.17% of Si, 0.77% of Mn, 0.019% of P, 0.010% of S, and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
(1) smelting in a converter or an electric furnace; and controlling the tapping temperature of smelting to be 1620-1660 ℃ during smelting.
(2) Refining in a refining furnace; controlling the slag alkalinity to be more than 3.0.
(3) Continuous casting and blank drawing; the tundish temperature of the continuous casting machine is 1500-1530 ℃, the tundish superheat degree is controlled to be 20-30 ℃, and the drawing speed is 0.6-0.8 m/min.
(4) Heating a steel billet; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1250-1300 ℃.
(5) Hot rolling to obtain a steel sheet pile finished product; the hot rolling comprises cogging rolling and universal continuous rolling, the temperature is not lower than 1150 ℃ during the cogging rolling, and the cogging rolling is carried out for 7 times in a reciprocating way by a cogging rolling mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 970 ℃, and the finish rolling temperature is 850-950 ℃.
Example 2: preparation of hot-rolled steel sheet pile with mark Q345P
The steel comprises the following chemical components in percentage by weight: 0.32% of C, 0.16% of Si, 0.77% of Mn, 0.023% of P, 0.019% of S, and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
(1) smelting in a converter or an electric furnace; and controlling the tapping temperature of smelting to be 1620-1660 ℃ during smelting.
(2) Refining in a refining furnace; controlling the slag alkalinity to be more than 3.0.
(3) Continuous casting and blank drawing; the tundish temperature of the continuous casting machine is 1500-1530 ℃, the tundish superheat degree is controlled to be 20-30 ℃, and the drawing speed is 0.6-0.8 m/min.
(4) Heating a steel billet; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1250-1300 ℃.
(5) Hot rolling to obtain a steel sheet pile finished product; the hot rolling comprises cogging rolling and universal continuous rolling, wherein the temperature is not lower than 1130 ℃ during the cogging rolling, and the cogging rolling is carried out for 7 times in a reciprocating way by a cogging rolling mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 970 ℃, and the finish rolling temperature is 850-950 ℃.
Example 3: preparation of Hot rolled Steel sheet pile of grade Q390P (please supplement the amounts of the following elements)
The steel comprises the following chemical components in percentage by weight: 0.37% of C, 0.15% of Si, 0.85% of Mn, 0.018% of P, 0.018% of S and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
(1) smelting in a converter or an electric furnace; and controlling the tapping temperature of smelting to be 1610-1650 ℃ during smelting.
(2) Refining in a refining furnace; controlling the slag alkalinity to be more than 3.0.
(3) Continuous casting and blank drawing; the tundish temperature of the continuous casting machine is 1490-1520 ℃, the tundish superheat degree is controlled to be 20-30 ℃, and the drawing speed is 0.5-0.75 m/min.
(4) Heating a steel billet; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1230-1280 ℃.
(5) Hot rolling to obtain a steel sheet pile finished product; the hot rolling comprises cogging rolling and universal continuous rolling, wherein the temperature is not lower than 1130 ℃ during the cogging rolling, and the cogging rolling is carried out for 7 times in a reciprocating way by a cogging rolling mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 950 ℃, and the finish rolling temperature is 840-940 ℃.
Example 4: preparation of hot-rolled steel sheet pile with mark Q420P
The steel comprises the following chemical components in percentage by weight: 0.41% of C, 0.12% of Si, 0.87% of Mn, 0.023% of P, 0.018% of S and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
(1) smelting in a converter or an electric furnace; and controlling the tapping temperature of smelting to be 1610-1650 ℃ during smelting.
(2) Refining in a refining furnace; controlling the slag alkalinity to be more than 3.0.
(3) Continuous casting and blank drawing; the tundish temperature of the continuous casting machine is 1490-1520 ℃, the tundish superheat degree is controlled to be 20-30 ℃, and the drawing speed is 0.5-0.75 m/min.
(4) Heating a steel billet; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1230-1280 ℃.
(5) Hot rolling to obtain a steel sheet pile finished product; the hot rolling comprises cogging rolling and universal continuous rolling, wherein the temperature is not lower than 1130 ℃ during the cogging rolling, and the cogging rolling is carried out for 7 times in a reciprocating way by a cogging rolling mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 950 ℃, and the finish rolling temperature is 830-930 ℃.
Example 5: preparation of hot-rolled steel sheet pile with mark Q460P
The steel comprises the following chemical components in percentage by weight: 0.46% of C, 0.09% of Si, 0.96% of Mn, 0.015% of P, 0.010% of S, and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
(1) smelting in a converter or an electric furnace; and controlling the tapping temperature of smelting to be 1600-1640 ℃ during smelting.
(2) Refining in a refining furnace; controlling the slag alkalinity to be more than 3.0.
(3) Continuous casting and blank drawing; the tundish temperature of the continuous casting machine is 1480-1510 ℃, the tundish superheat degree is controlled to be 20-30 ℃, and the drawing speed is 0.5-0.7 m/min.
(4) Heating a steel billet; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1210-1260 ℃.
(5) Hot rolling to obtain a steel sheet pile finished product; the hot rolling comprises cogging rolling and universal continuous rolling, wherein the temperature is not lower than 1110 ℃ during the cogging rolling, and the cogging rolling is carried out for 7 times in a reciprocating way by a cogging rolling mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 940 ℃, and the finish rolling temperature is 820-920 ℃.
The yield strength, tensile strength and elongation of the hot-rolled steel sheet piles prepared in the examples were measured
Samples were taken from the hot-rolled steel sheet piles obtained in examples 1 to 5, and the samples were long blocks sawed from the hot-rolled steel sheet piles, and a snap test was performed on each sample by a universal material testing machine.
The results of the measurements are shown in the following table:
from the above table, the performances of the hot rolled steel sheet piles prepared in the embodiments 1 to 5 respectively satisfy the requirements of the mechanical properties of Q295P, Q345P, Q390P, Q420P and Q460P specified in GB/T20933-2014.
Therefore, the invention accurately controls the contents of the main components of carbon, silicon, manganese, phosphorus and sulfur in the finished steel product of the hot-rolled steel sheet pile by reasonably controlling the chemical components of the steel product of the hot-rolled steel sheet pile, adopting a brand-new chemical component system and adopting a collaborative production method, ensures that the mechanical property and the internal structure meet the use requirement of the steel sheet pile, and achieves the mechanical property requirements of the hot-rolled steel sheet piles of different brands.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (3)
1. The hot-rolled steel sheet pile is characterized in that steel comprises the following chemical components in percentage by weight: 0.41% of C, 0.12% of Si, 0.87% of Mn, 0.023% of P, 0.018% of S and the balance of Fe and inevitable impurities; or the steel comprises the following chemical components in percentage by weight: 0.46% of C, 0.09% of Si, 0.96% of Mn, 0.015% of P, 0.010% of S, and the balance of Fe and inevitable impurities;
the production method of the hot-rolled steel sheet pile comprises the following steps:
(1) smelting in a converter or an electric furnace; controlling the tapping temperature of smelting to be 1600-1660 ℃ during smelting;
(2) refining in a refining furnace; controlling the slag alkalinity to be more than 3.0 during refining in the refining furnace;
(3) continuous casting and blank drawing; the tundish temperature of the continuous casting machine is 1480-1550 ℃, the tundish superheat degree is controlled to be 20-30 ℃, and the casting speed is 0.5-0.8 m/min;
(4) heating a steel billet; the temperature of a steel rolling heating furnace is 1210-1300 ℃;
(5) hot rolling to obtain a steel sheet pile finished product; the hot rolling comprises cogging rolling and universal continuous rolling, wherein the temperature is not lower than 1110 ℃ during the cogging rolling, and the cogging rolling is carried out for 7 times in a reciprocating way by a cogging rolling mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 940 ℃, and the finish rolling temperature is 820-950 ℃.
2. The method for producing a hot-rolled steel sheet pile according to claim 1, comprising the steps of:
(1) smelting in a converter or an electric furnace; controlling the tapping temperature of smelting to be 1600-1660 ℃ during smelting;
(2) refining in a refining furnace; controlling the slag alkalinity to be more than 3.0 during refining in the refining furnace;
(3) continuous casting and blank drawing; the tundish temperature of the continuous casting machine is 1480-1550 ℃, the tundish superheat degree is controlled to be 20-30 ℃, and the casting speed is 0.5-0.8 m/min;
(4) heating a steel billet; when a steel billet is heated, the temperature of a steel rolling heating furnace is 1210-1300 ℃;
(5) hot rolling to obtain a steel sheet pile finished product; the hot rolling comprises cogging rolling and universal continuous rolling; the temperature is not lower than 1110 ℃ during cogging rolling, and the steel is rolled for 7 times in a reciprocating way by a cogging mill; when universal continuous rolling is carried out, the start rolling temperature of the universal continuous rolling unit is not lower than 940 ℃, and the finish rolling temperature is 820-950 ℃.
3. The use of the hot-rolled steel sheet pile according to claim 1 in watertight engineering and structural foundation engineering.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055127A (en) * | 1991-02-07 | 1993-01-14 | Nippon Steel Corp | Production of high strength steel sheet pile |
| CN101838773A (en) * | 2010-04-30 | 2010-09-22 | 武汉钢铁(集团)公司 | Steel for acid soil corrosion-resistant hot rolling U-shaped steel sheet pile and production method thereof |
| CN101845584A (en) * | 2010-04-09 | 2010-09-29 | 武汉钢铁(集团)公司 | Fresh-water corrosion resistant steel for U-shaped steel sheet pile and method for producing same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055127A (en) * | 1991-02-07 | 1993-01-14 | Nippon Steel Corp | Production of high strength steel sheet pile |
| CN101845584A (en) * | 2010-04-09 | 2010-09-29 | 武汉钢铁(集团)公司 | Fresh-water corrosion resistant steel for U-shaped steel sheet pile and method for producing same |
| CN101838773A (en) * | 2010-04-30 | 2010-09-22 | 武汉钢铁(集团)公司 | Steel for acid soil corrosion-resistant hot rolling U-shaped steel sheet pile and production method thereof |
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