Specialized In Die Casting Service And Parts with Professional Design and Development

102,No.41,Changde Road,Xiaojiejiao,Humen Town,Dongguan,China | +86 769 8151 9985 | sales@hmminghe.com

The Optimization Of Low-Alloy High-Strength Steel Welding Consumables Composition

Publish Time: Author: Site Editor Visit: 10543

The optimization direction of the weld structure of low-alloy high-strength steel is to generate more acicular ferrite. Studies have shown that acicular ferrite has fine grain size and high density of dislocations. When its content is greater than 65% and the average lath size is about 1 μm, the weld metal can have excellent strength and toughness.

The Optimization Of Low-Alloy High-Strength Steel Welding Consumables Composition

How to obtain the above organization?

Appropriate welding material alloy composition design is the key.

  1. C. The C content is generally controlled at 0.05% to 0.10%, and the carbon equivalent is less than 0.39. In this range, side slat ferrite and acicular ferrite can be generated, and the reheat zone of the weld is transformed into equiaxed massive ferrite.
  2. Mn. Mn has two opposite effects on weld metal refinement and hardening. A proper Mn content can obtain more acicular ferrite. However, excessive addition of Mn will cause the grain boundary nucleation rate of bainite to be higher than the intragranular nucleation rate of acicular ferrite, which will increase the hardness of the weld. The Mn content is generally controlled at 0.6 to 1.8%.
  3. Cr. As the Cr content in the weld metal increases, the number of acicular ferrite increases, the microstructure of the weld is refined, and the proeutectoid ferrite in the columnar zone and the coarse-grained zone decreases. The impact toughness decreases with the increase of Cu content and increases with the increase of Cr content. The Cr content is generally 0.9 to 1.0%.
  4. Ti. The Ti content range for obtaining the optimal combination of structure and impact performance is 0.02% to 0.05%. Studies have shown that when the Ti content in the weld metal is 0.014% to 0.048%, the weld structure of the Q235 plate is mainly composed of equiaxed ferrite and acicular ferrite. With the increase of Ti content, acicular ferrite The increase in content and the decrease in length will increase the toughness of the weld metal. This is due to the formation of TiO2 inclusions when the Ti content in the weld metal is higher than the Al content, which is conducive to the nucleation of acicular ferrite.
  5. B. Experiments show that when the B content is between 0.0032% and 0.0103%, the acicular ferrite decreases with the increase of the B content, and the impact energy is significantly reduced. This is due to the decrease of the eutectoid temperature caused by B. However, if higher Ti is added to the welding wire and lower alkalinity is ensured, and when the ratio of boron to nitrogen (B/N) in the weld metal is in the range of 0.6 to 0.8, the formation of needles can be beneficial. The ferrite nucleated Ti-containing oxide inclusions can obtain a higher impact toughness value for the weld metal; if the B/N is higher than 0.8, the impact toughness will decrease. The B content is generally controlled within 0.003~0.006%.
  6. O. O is a restrictive impurity element in the weld metal. Al, Mg and other strong reducing agents are often added to the weld metal to deoxidize and fix nitrogen, but it is easy to generate polygonal AlN brittle inclusions, which seriously damage the low temperature toughness of the weld metal. It is proposed in the literature that adding an appropriate amount of LiF to the flux core will generate Li3N with N in the arc zone, thereby significantly reducing the N content in the weld metal and reducing the number of harmful AlN inclusions. There is also a view that the formation of V(C, N) phase by precipitation of N and V can promote the nucleation of acicular ferrite. It is also pointed out in the literature that the addition of appropriate amounts of Fe2O3, MnO2, etc. to the core can increase the O content in the weld metal, but form circular inclusions dominated by Al2O3, which is still conducive to obtaining acicular ferrite. Weld organization. It is generally believed that within the limit of Al/O = 0.45, an appropriate increase in the Al/O ratio in the low alloy steel weld metal can promote the generation of more inclusions with a size of 0.2 to 0.8 μm, promote the nucleation of acicular ferrite, and thus Toughness is favorable.
  7. S. S is also a restrictive impurity element in weld metal, but FeS particles containing a small amount of Mn and Cu are effective for nucleation of acicular ferrite.

In addition, the control of the size and shape of inclusions is also very important. It is generally believed that spherical particles mainly composed of MnS and other amorphous phases with a size of 0.5-0.8 μm and a thin layer of TiO on the surface are most advantageous for acicular ferrite nucleation.


Please keep the source and address of this article for reprinting:The Optimization Of Low-Alloy High-Strength Steel Welding Consumables Composition


Minghe Die Casting Company are dedicated to manufacture and provide quality and high performance Casting Parts(metal die casting parts range mainly include Thin-Wall Die Casting,Hot Chamber Die Casting,Cold Chamber Die Casting),Round Service(Die Casting Service,Cnc Machining,Mold Making,Surface Treatment).Any custom Aluminum die casting, magnesium or Zamak/zinc die casting and other castings requirements are welcome to contact us.

ISO90012015 AND ITAF 16949 CASTING COMPANY SHOP

Under the control of ISO9001 and TS 16949,All processes are carried out through hundreds of advanced die casting machines, 5-axis machines, and other facilities, ranging from blasters to Ultra Sonic washing machines.Minghe not only has advanced equipment but also have professional team of experienced engineers,operators and inspectors to make the customer’s design come true.

POWERFUL ALUMINUM DIE CASTING WITH ISO90012015

Contract manufacturer of die castings. Capabilities include cold chamber aluminum die casting parts from 0.15 lbs. to 6 lbs., quick change set up, and machining. Value-added services include polishing, vibrating, deburring, shot blasting, painting, plating, coating, assembly, and tooling. Materials worked with include alloys such as 360, 380, 383, and 413.

PERFECT ZINC DIE CASTING PARTS IN CHINA

Zinc die casting design assistance/concurrent engineering services. Custom manufacturer of precision zinc die castings. Miniature castings, high pressure die castings, multi-slide mold castings, conventional mold castings, unit die and independent die castings and cavity sealed castings can be manufactured. Castings can be manufactured in lengths and widths up to 24 in. in +/-0.0005 in. tolerance.  

ISO 9001 2015 certified manufacturer of die cast magnesium and mold manufacturing

ISO 9001: 2015 certified manufacturer of die cast magnesium, Capabilities include high-pressure magnesium die casting up to 200 ton hot chamber & 3000 ton cold chamber, tooling design, polishing, molding, machining, powder & liquid painting, full QA with CMM capabilities, assembly, packaging & delivery.

Minghe Casting Additional Casting Service-investment casting etc

ITAF16949 certified. Additional Casting Service Include investment casting,sand casting,Gravity Casting, Lost Foam Casting,Centrifugal Casting,Vacuum Casting,Permanent Mold Casting,.Capabilities include EDI, engineering assistance, solid modeling and secondary processing.

Casting Parts Application Case Studies

Casting Industries Parts Case Studies for: Cars, Bikes, Aircraft, Musical instruments, Watercraft, Optical devices, Sensors, Models, Electronic devices, Enclosures, Clocks, Machinery, Engines, Furniture, Jewelry, Jigs, Telecom, Lighting, Medical devices, Photographic devices, Robots, Sculptures, Sound equipment, Sporting equipment, Tooling, Toys and more. 


What Can we help you do next?

∇ Go To Homepage For Die Casting China

Casting Parts-Find out what we have done.

→Ralated Tips About Die Casting Services


By Minghe Die Casting Manufacturer |Categories: Helpful Articles |Material Tags: , , , , , ,Bronze Casting,Casting Video,Company History,Aluminum Die Casting |Comments Off

MingHe Casting Advantage

  • Comprehensive Casting design software and skilled engineer enables sample to be done within 15-25 days
  • Complete set of inspection equipment & quality control makes excellent Die Casting products
  • A fine shipping process and good supplier guarantee we can always deliver Die Casting goods on time
  • From prototypes to end parts, upload your CAD files, fast and professional quote in 1-24 hours
  • Wide-ranging capabilities for designing prototypes or massive manufacturing end use Die Casting parts
  • Advanced Die Casting techniques (180-3000T Machine,Cnc Machining, CMM) process a variety of metal & plastic materials

HelpFul Articles

High Vacuum/Strength And Toughness Die Casting Technology

High vacuum die-casting technology refers to the liquid metal filling the mold cavity at a very high

Research Trends Of Heat Treatment Of High-Strength Steel, DP Steel And Martensitic Steel

With the increase in strength of steel materials, martensite is used in various steels. However, bec

Influence of High Temperature Nitrogen Solution Treatment on Corrosion Resistance

Nitriding and carburizing treatment on the surface of steel products can improve the mechanical prop

The Influencing Factors Of 500MPa Grade V-N Microalloyed High-strength Steel Bars Properties

The effect of nitrogen content on the mechanical properties of 500MPa grade VN microalloyed high-str

The Role Of Various Elements In High-Strength Martensitic Wear-Resistant Steel

About 80% of the failures of mechanical parts are caused or induced by various forms of wear. Abrasi

Effect of homogenization treatment on high temperature deformation characteristics of as cast Incoloy800 alloy

Incoloy800 is a solid solution reinforced austenite alloy, which has high creep fracture strength, g

The Heat Treatment Process Of High Manganese And Low Nickel Stainless Steel

In recent years, with the rapid development of China's economy, the demand for stainless steel has c

The Measures To Improve High Anti-Collapse Casing Life

The problem of casing damage seriously restricts oil and gas production, reduces the production life

The Optimization Of Low-Alloy High-Strength Steel Welding Consumables Composition

The optimization direction of the weld structure of low-alloy high-strength steel is to generate mor