High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe
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 manufacturing method and high toughness technology, applied in the field of metallurgical technology, to achieve the effect of simple manufacturing process, good performance uniformity, and easy realization
Inactive Publication Date: 2016-10-05
ANGANG STEEL CO LTD
View PDF8 Cites 5 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
In China, some people used the Cr-Ni-Mn-Mo-V-B alloy steel with good low carbon to trial-...
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 1
[0023] The mass percentage of the chemical composition of the high-strength and high-toughness crane jib pipe is:
[0024] C 0.15%, Si0.50%, Mn 1.40%, P 0.010%, S 0.008%, Cr 0.46%, Ni 0.13%, Mo 0.34%, V 0.08%, Ti≤0.05%, W 0.40%, Al 0.042%, Cu≤0.02%, Nb≤0.05%, N≤0.007%, the rest are iron and impurities.
[0025] Process route: hot metal pretreatment→converter smelting→LF+VD refining→continuous casting and rolling→hot rolling→heat treatment→flaw detection.
[0026] Refining outside the furnace: Add ferro-titanium 6 minutes before the end of refining.
[0027] Hot rolling process: the heating temperature of the tube billet is 1265°C; the continuous rolling is made of a mandrel with no defects on the surface, and graphite is used for lubrication; the sizing is descaled with high-pressure water.
[0028] Heat treatment process: Quenching and tempering treatment: quenching temperature 930°C to fully austenitize the steel pipe, water quenching to ensure the center line of the steel...
Embodiment 2
[0030] The high-strength and high-toughness crane jib tube has a chemical composition in mass percentage of:
[0031] C 0.17%, Si 0.35%, Mn 1.30%, P 0.013%, S 0.005%, Cr 0.40%, Ni 0.20%, Mo 0.28%, V 0.12%, Ti≤0.05%, W 0.34%, Al 0.03%, Cu ≤0.02%, Nb≤0.05%, N≤0.007%, the remainder is iron and impurities.
[0032] Process route: hot metal pretreatment→converter smelting→LF+VD refining→continuous casting and rolling→hot rolling→heat treatment→flaw detection.
[0033] Refining outside the furnace: Add ferro-titanium 8 minutes before the end of refining.
[0034] Hot rolling process: the heating temperature of the tube billet is 1275°C; continuous rolling is carried out with a mandrel with no defects on the surface, and graphite is used for lubrication; high-pressure water is used for descaling for sizing.
[0035] Heat treatment process: Quenching and tempering treatment: Quenching temperature 925°C to fully austenitize the steel pipe, water quenching to ensure the center line of...
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
Login to view more
Abstract
The invention provides a high-strength high-toughness pipe for a crane boom. The high-strength high-toughness pipe consists of the following components in percentage by mass: 0.14-0.18% of C, 0.30-0.50% of Si, 1.30-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.35-0.50% of Cr, 0.10-0.20% of Ni, 0.25-0.38% of Mo, 0.07-0.12% of V, less than or equal to 0.05% of Ti, 0.30-0.45% of W, 0.02-0.05% of Al, less than or equal to 0.02% of Cu, less than or equal to 0.05% of Nb, less than or equal to 0.007% of N, and the balance iron and impurities. Ferrotitanium is added 5-8 minutes before ending external refining. A pipe blank heating temperature ranges from 1260 DEG C to 1280 DEG C; a steel pipe quenching temperature ranges from 920 DEG C to 930 DEG C, a tempering temperature ranges from 690 DEG C to 700 DEG C, and thermal insulation time ranges from 40 minutes to 60 minutes. The process is simple and easy to realize; the boom is welded and judged according to the technical requirements of standard Pressure-bearing Equipment Welding Procedure Qualification NB/T47014-2011; bending tests such as a room-temperature tensile test, a lateral bending test, a surface bending test and a back bending test as well as a low-temperature impact test at (-)40 DEG C of the boom are qualified; and moreover, production performances are uniform and stability is good.
Description
technical field [0001] The invention belongs to the technical field of metallurgical technology, and in particular relates to a high-strength and high-toughness seamless steel pipe for a boom of a crane and a manufacturing method thereof. Background technique [0002] Lifting industry is one of the important basic industries in national economic construction. Hydraulic crawler crane is a kind of self-propelled crane used in high-rise building construction. It is a lifting operation machine with high technical content, complicated manufacturing process and unique performance in construction machinery. It has relatively large lifting capacity and small turning radius. It has the characteristics of hoisting, low specific pressure on the crawler belt to the ground, low environmental requirements, good operation stability, and free replacement of the truss combination, so it is widely used in building bridges, installing power generation equipment, installing oil refining equipme...
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.
Login to view more 
Login to view more