Ultra-wide high-strength high-toughness steel for marine engineering and manufacturing method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A high-strength, high-toughness, marine engineering technology, applied in the field of iron and steel material preparation, can solve the problems of low-temperature toughness not achieving fracture toughness performance, failure to reach, and affecting actual yield, etc., to increase the width range of steel plate products and improve low-temperature fracture toughness Effect
Active Publication Date: 2019-01-15
ANGANG STEEL CO LTD
View PDF9 Cites 9 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
The patent composition design is as follows: C: 0.01% ~ 0.06%, Si: 0.01% ~ 0.8%, Mn: 1.0% ~ 1.8%, Al: 0.01% ~ 0.08%, Nb: 0.02% ~ 0.08%, Ni: 0.20% ~0.8%; the width of the steel plate obtained by this patented technology cannot reach 4000mm, which cannot guarantee the special needs of large container ships for special purposes and marine mining equipment
[0005] CN200910147530.8 proposes a method for preparing thick plate steel with brittle crack propagation stop characteristics. The composition of the patent is designed as follows: C: 0.05% to 0.12%, Si: 0.05% to 0.30%, Mn: 1.00% to 1.80%, Al: 0.01% to 0.06%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.05%, B: 0.0005% to 0.003%, N: 0.0020% to 0.0090%; in this technology, the thickness direction cannot be guaranteed Requirements such as toughness, strength and microstructure uniformity at t / 4~t / 2 positions; in addition, this technical requirement requires cooling, rolling and reheating processes during the rolling process, making the manufacturing process more complex and increasing the actual Difficulty in operation, which affects the actual yield, and the patented technology can obtain a steel plate width of less than 4000mm
[0006] CN103451534B proposes a steel plate for offshore platforms with excellent performance in the thickness direction of 60mm and its production method. The composition of the patent is designed as follows: C: 0.09-0.14%; Si: 0.20%-0.50%; Mn: 1.10%-1.50%; P≤ 0.015%; S≤0.005%; Al: 0.015% ~ 0.050%; Nb: 0.030% ~ 0.060%; Ti: 0.010% ~ 0.020%; the steel plate strength and low temperature toughness achieved by this patent have not achieved good fracture toughness , the patented technology can get the steel plate width less than 4000mm
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0033] The following examples are used to specifically illustrate the contents of the present invention, and these examples are only general descriptions of the contents of the present invention, and do not limit the contents of the present invention.
[0034] Table 1 is the chemical composition of the embodiment steel; Table 2 is the smelting process of the embodiment steel; Table 3 is the rolling process of the embodiment steel; Table 4 is the mechanical properties of the embodiment steel; Table 5 is the low temperature of the embodiment steel of the present invention performance and NDTT temperature.
[0035] Table 1 steel chemical composition wt% of the embodiment of the present invention
[0036] Example
C
Si
mn
Cu
Ni
als
Nb
Ti
V
1
0.05
0.42
1.20
0.39
0.16
0.03
0.023
0.012
0.055
2
0.10
0.15
1.33
0.23
0.19
0.05
0.034
0.020
0.046
3
0.07
0.27
1.31
0...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
width
aaaaa
aaaaa
thickness
aaaaa
aaaaa
width
aaaaa
aaaaa
Login to view more
Abstract
The invention discloses ultra-wide high-strength high-toughness steel for marine engineering and a manufacturing method thereof. The steel comprises 0.05 to 0.10% of C, 0.10 to 0.50% of Si, 1.2 to 1.5% of Mn, 0.20 to 0.40% of Cu, 0.10 to 0.30% of Ni, no more than 0.01% of P, no more than 0.01% of S, 0.01 to 0.05% of Als, 0.020 to 0.040% of Nb, 0.010 to 0.020% of Ti and 0.040 to 0.070% of V. According to the invention, a heating temperature is 1,150 to 1,200 DEG C, and heat preservation is performed for 30-60 min; in a first stage, rolling temperature is 1,000-1,050 DEG C, and an average single-pass reduction rate is no less than 15%; in a second stage, rolling temperature is 850-950 DEG C, and an average single-pass reduction rate is no less than 15%; in a third stage, rolling temperatureis 800-830 DEG C, and an average single-pass reduction rate is more than 10%; and an average cooling rate is more than 3 DEG C / s, a self-tempering temperature is 600-650 DEG C, and slow cooling time is no less than 24h. A manufactured steel plate has a width of 3,500 to 4,500 mm and is high in strength and excellent in low-temperature toughness.
Description
technical field [0001] The invention belongs to the field of iron and steel material preparation, and relates to a steel plate with ultra-wide specifications, thick specifications, high strength, and excellent low-temperature toughness characteristics, especially the strength at the 1 / 4 and 1 / 2 positions of the plate thickness direction, excellent low-temperature impact energy and fracture toughness and its manufacturing method. Background technique [0002] With the increasing demand for large-scale marine transportation and mining equipment, the demand for equipment materials for marine engineering is increasing, and the requirements are also increasing. Steel plates for offshore platforms must have strict requirements for ultra-wide specifications, high strength, high toughness, good weldability and thick specifications, especially the fracture toughness of materials. [0003] The ultra-wide high-strength toughness steel plate can save welding work and improve the stabil...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.