High-strength alloy steel smelting method
A smelting method and alloy steel technology, applied in the field of metallurgy, can solve the problems of difficult to meet and meet the technical quality requirements of customers, and achieve the effect of improving the level of product flaw detection, good mechanical properties and high cleanliness
Inactive Publication Date: 2019-07-09
姜玉娟
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In this way, the molten steel cannot be further purified, so it is difficult to meet and meet the customer's requirements for the technical quality of special and important products.
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 moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0047] 1) With a smelting capacity of 30 tons, first add 0.55-0.6 tons of small crushed ore (mainly composed of Fe2O3, content 60wt%-70wt%) and 0.65-0.7 tons of lime (calcium oxide) to the bottom of the electric arc furnace for early production slag, and then put 28.5-28.7 tons of low-sulfur phosphorus clean steel (in which iron content ≥ 98wt%, carbon content ≤ 0.2wt%, sulfur and phosphorus content ≤ 0.05wt% respectively), electrified melting, adding carburant to mix carbon, so that The carbon content reaches 0.78%; 132 kg Mo and 750 kg Ni are added during the melting period;
[0048] Blow oxygen into the molten steel, and add 0.3-0.4 tons of small crushed ore or scale and 0.45-0.5 tons of lime to the molten steel in 2 to 4 times. Oxidation and smelting at 1560±20°C for 1 to 1.5 hours for decarburization and dephosphorization; at the end of the oxidation period, the decarburization amount is ≥0.4%;
[0049] (2) Pour the molten steel after dephosphorization and decarburizatio...
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 |
|---|---|---|
| melting point | aaaaa | aaaaa |
| yield strength | aaaaa | aaaaa |
| tensile strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention relate to the metallurgy field, in particular to a smelting process of high strength alloy steel for material of a drill bit and a pump head body. The alloy material adding sequence is adjusted, Mo and Ni are added at the initial smelting stage of an electric-arc furnace, and the decarburization quantity is also increased; a double deoxidizer at the LF furnace refining stage can purify a steel ingot and improve the mechanical property; and aluminum is added before vacuum degassing to promote alloying of molten steel, enable the molten steel alloying process to be more sufficient,and reduce oxide inclusion. The steel ingot has the advantages of being high in cleanliness, surface quality and hardenability and fine in grain size, is high in strength and mechanical property andresists high pressure and corrosion. According to the smelting process, an excellent deoxidation effect can be realized without the electroslag remelting working procedure, the content of nonmetallicinclusion is reduced, the product flaw detection level is increased, and the energy consumption and cost are reduced on the premise of ensuring the usability.
Description
technical field [0001] The invention relates to the field of metallurgy, in particular to a high-strength alloy steel smelting process for drill bits and pump head body materials. Background technique [0002] Oil exploration drill bits include roller cone bits, scraper bits, diamond bits, etc. Among them, roller cone bits account for more than 90% of the oil drilling usage in various countries. The steel used is generally low-carbon high-strength alloy carburizing steel, such as Ni -Cr-Mo system and Ni-Mo system. [0003] In the process of oil drilling, it is greatly affected by geological conditions, especially complex landforms, and the requirements for drill pipe materials are also high. Generally, it is made of American standard 4330V material, which is equivalent to the domestic brand 30CrNiMoV material. This material is also used for the pump head of the multi-cylinder plunger pump. Therefore, this material must have excellent comprehensive mechanical properties, wh...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/068C21C7/06C21C7/072C21C7/10C22C33/06C22C38/44C22C38/04C22C38/02
CPCC21C7/06C21C7/064C21C7/068C21C7/072C21C7/10C22C33/06C22C38/02C22C38/04C22C38/44Y02P10/20
Inventor 姜玉娟
Owner 姜玉娟