HD380LA steel FAQS
What is HD380LA steel?
HD380LA is a kind of high-strength and low-alloy steel, which is a kind of weldable low-carbon engineering structural steel. It has been used in many applications, including aerospace, automotive and marine industries.
What is the chemical composition of HD380LA alloy?
HD380LA alloy is a high-strength low-alloy steel, containing manganese, silicon and copper as the main alloying elements. Other trace elements include chromium, molybdenum, nickel, vanadium and zinc. These alloy elements together endow HD380LA alloy with the required mechanical and physical properties. For example, the addition of manganese increases the hardness of the alloy, while silicon increases the strength. Copper improves the overall toughness of HD380LA, while chromium improves its corrosion resistance. The commonly used alloying elements can be divided into solid solution strengthening elements (Mn, S, A1, Cr, Ni, Mo, Cu, etc.) according to their role in the strengthening mechanism of steel; Refine grain elements (A1, Nb, V, T, N, etc.); Precipitation hardening elements (Nb, V, Ti, etc.) and phase transformation strengthening elements (Mn, Si, Mo, etc.) C form pearlite or dispersed precipitated alloy carbides in the steel to strengthen the steel. In order to form a certain amount of carbon-nitride in microalloyed steel, the carbon content only needs 0.01~0.02%. Therefore, carbon reduction is an inevitable trend in the development of such steel, which can greatly improve the toughness and welding performance of steel.
High Mn/C ratio is beneficial to improve the yield strength and impact toughness of steel. Manganese can reduce the y a transition temperature; It is beneficial to the nucleation of acicular ferrite: during the heating process, the solubility of carbon-nitride forming elements in y-Fe can be increased, thus increasing the amount of carbide dispersion precipitation in ferrite. In addition, the change of stress/strain characteristics of steel caused by high manganese can offset the strength loss of Bauschinger effect. Si Most low alloy high strength steels do not need silicon alloying, but silicon is an indispensable addition element in hot-rolled ferritic-martensite multiphase steel.
Mo aluminum-containing steel (~0.15% Mo) has higher strength and toughness than traditional ferrite-pearlite steel. It can inhibit pearlite transformation of steel during cooling. The platinum content in acicular ferrite steel and ultra-low carbon bainite steel is generally 0.2~0.4%.
What are the physical properties of HD380LA alloy?
HD380LA is an austenitic stainless steel containing 18% chromium and 8% nickel. It has excellent corrosion resistance and is often used in chemical processing, petrochemical and food industries. The melting point of this alloy is 2102 ° F (1149 ° C).
The carbon content of HD380LA steel is usually less than 0.25%, and it has higher yield point s or yield strength 0.2 (30~80kgf/mm2) and yield strength ratio s/b (0.65~0.95) than ordinary carbon structural steel, better cold and hot processing formability, good baking ability, lower cold brittleness tendency, notch and aging sensitivity.
What is the production process of HD380LA steel?
Low-alloy high-strength steel can be smelted in open hearth, converter or electric furnace. After 1979, China has produced Nb, V, Ti low alloy high strength steel using the process flow of oxygen top blowing converter – ladle argon blowing – continuous casting slab – hot continuous rolling, or electric furnace – ladle powder injection – thick plate mill. Steel is generally used after hot rolling. In order to obtain uniform structure and stable properties, traditional metal heat treatment methods such as high-temperature tempering, normalizing, quenching and tempering are usually used. Non-quenched and tempered thick plates with yield strength greater than 60 kgf/mm2 can also be produced by controlled cooling after rolling.
What is the heat treatment specification of HD380LA?
- Quenching: 950 ℃ for the first time, 890 ℃ for the second time, oil cooling
- Temper 230 ℃, air cooling and oil cooling.
- 880 ℃ isothermal at 280~310
What is the heat treatment of HD380LA alloy?
HD380LA alloy is a high strength low alloy steel, which can be heat treated to obtain various desired properties. This alloy is commonly used in applications that require strength and durability, such as building and automotive components. The heat treatment of HD380LA alloy can improve the strength, toughness, ductility and wear resistance of the material. The specific heat treatment process used will depend on the desired properties required for the application. It also has good corrosion resistance to atmosphere and seawater.
What are the properties of HD380LA steel?
The alloy element content of HD380LA steel is generally lower than 2.5%, and it is used after hot rolling or simple heat treatment (non quenched and tempered), so this kind of steel can be produced in large quantities and widely used. The output of low-alloy high-strength steel in developed industrial countries accounts for about 10% of the steel output. At the end of the 19th century, in the early stage of the development of low-alloy high-strength steel, the alloy design of steel grades only considered tensile strength. Some alloy elements such as Si. Mn, Ni, C are added to the steel to improve the service performance in some aspects, but the main means to obtain high strength still depends on the high code content. With the development of steel structure from riveting to welding, in order to improve the brittle fracture resistance of steel, the carbon content in steel is gradually reduced and the direction of composite alloying is changed. In the 1950s, in order to save alloy elements, heat treatment was used to obtain a good match between strength and toughness. In the 1960s, a new stage called microalloying and controlled rolling production began, and some new steel grades appeared. By the 1970s, the mature micro-pearlitic steel and non-pearlitic steel, acicular ferrite steel, ultra-low carbon bainitic steel, hot-rolled dual-phase steel and low carbon martensitic steel were widely used in oil and gas transmission pipelines, deep oil pipes, automobile steel plates and other fields; It is expected that in the 1980s, these steels will play an important role in engineering structural materials. China began to develop low-alloy high-strength steel in 1957, and developed M, Mn-V, Mn-Ti, Mn-Nb and Mn-Mo in combination with China’s resources.
What are the applications of HD380LA alloy?
HD380LA alloy is a high-strength, low-alloy steel, which can be used for various structural applications. It is usually used for bridges, buildings and construction equipment. HD380LA alloy has higher yield strength than other ordinary steels, so it is very suitable for applications where strength is the key factor.
HD380LA alloy is an ideal choice for many applications because it has various ideal properties. It is durable, light weight, and can be used in a variety of products. Its corrosion resistance makes it an ideal choice for outdoor use, and its excellent machinability ensures that any parts requiring precise cutting can be easily produced using this material. In general, HD380LA alloy provides all the advantages of high-quality aluminum alloy products.