precision forging SWRH47B steel forgings

precision forging SWRH47B steel forgings

A type of SWRH47B carbon steel. The carbon content is about 0.05% to 0.70%, and some can be as high as 0.90%. It can be divided into two categories: ordinary

SWRH47B carbon structural steel

SWRH47B carbon structural steel and carbon structural steel. The former contains more impurities and is cheap. It is used in places where performance requirements are not high. Its carbon content is mostly below 0.30%, and its manganese content does not exceed 0.80%. The strength is low, but the plasticity, toughness, and cold deformation properties are good. Except for a few cases, it is generally not heat treated and used directly. It is mostly made into strip steel, special-shaped steel, steel plates, etc. It has many uses and a large amount. It is mainly used in railways, bridges, various construction projects, and the manufacture of various metal components that bear static loads and unimportant mechanical parts and general welded parts that do not require heat treatment. Carbon structural steel is pure, has few impurities, and has good mechanical properties. It can be used after heat treatment. According to the manganese content, it is divided into two groups: ordinary manganese content (less than 0.80%) and higher manganese content (0.80%~1.20%). Carbon content below 0.25% is mostly used directly without heat treatment, or treated by carburizing, carbonitriding, etc. to manufacture small and medium gears, shafts, piston pins, etc.; carbon content is 0.25%~0.60%, typical steel grades are 40, 45, 40Mn, 45Mn, etc., and are mostly quenched and tempered to manufacture various mechanical parts and fasteners; carbon content exceeds 0.60%, such as 65, 70, 85, 65Mn, 70Mn, etc., are mostly used as spring steel.

1. Classification by chemical composition

Carbon steel can be divided into low carbon steel, medium carbon steel and high carbon steel according to chemical composition (i.e. carbon content). Low carbon steel is also called mild steel, with a carbon content ranging from 0.10% to 0.25%. Low carbon steel is easy to accept various processing such as forging, welding and cutting, and is often used to make chains, rivets, bolts, shafts, etc.

Medium carbon steel Carbon steel with a carbon content of 0.25% to 0.60%. There are many products such as steel, semi-steel, boiling steel, etc. In addition to carbon, it can also contain a small amount of manganese (0.70% to 1.20%). According to product quality, it is divided into ordinary carbon structural steel and carbon structural steel. It has good hot working and cutting performance, but poor welding performance. The strength and hardness are higher than those of low carbon steel, while the plasticity and toughness are lower than those of low carbon steel. It can be used directly as hot-rolled material or cold-drawn material without heat treatment, or it can be used after heat treatment. Medium carbon steel has good comprehensive mechanical properties after quenching and tempering. The hardness that can be achieved is about HRC55 (HB538), and σb is 600 to 1100MPa. Therefore, in various uses with medium strength levels, medium carbon steel is widely used. In addition to being used as a building material, it is also widely used to manufacture various mechanical parts.

High carbon steel is often called tool steel, with a carbon content ranging from 0.60% to 1.70%, which can be hardened and tempered. Hammers, crowbars, etc. are made of steel with a carbon content of 0.75%; cutting tools such as drills, taps, reamers, etc. are made of steel with a carbon content of 0.90% to 1.00%.

2. Classification by steel quality

According to the quality of steel, it can be divided into ordinary carbon steel and carbon steel.

Ordinary carbon structural steel is also called ordinary carbon steel, which has a wide range of restrictions on carbon content, performance range, and phosphorus, sulfur and other residual elements. In China and some countries, it is divided into three categories according to the conditions of delivery: Class A steel (Class A steel) is steel with mechanical properties. Class B steel (Class B steel) is steel with chemical composition. Special steel (Class C steel) is a steel with both excellent mechanical properties and excellent chemical composition, and is often used to manufacture more important structural parts. At present, China produces and uses mostly A3 steel (Class A No. 3 steel) with a carbon content of about 0.20%, which is mainly used for engineering structures. Some carbon structural steels also add trace amounts of aluminum or niobium (or other carbide-forming elements) to form nitride or carbide particles to limit grain growth, strengthen the steel, and save steel. In China and some countries, in order to meet the special requirements of steel, the chemical composition and properties of ordinary carbon structural steel are adjusted, thus developing a series of ordinary carbon structural steels (such as bridges, buildings, steel bars, pressure vessels, etc.).

Compared with ordinary carbon structural steels, carbon structural steels have lower content of sulfur, phosphorus and other non-metallic inclusions. According to the different carbon content and uses, this type of steel is roughly divided into three categories: less than 0.25%C is low carbon steel, especially 08F, 08Al with a carbon content of less than 0.10%, which are widely used for deep-drawing parts such as automobiles and cans due to their good deep-drawing and weldability. 20G is the main material for making ordinary boilers. In addition, low carbon steel is also widely used as carburizing steel for the machinery manufacturing industry. 0.25-0.60%C is medium carbon steel, which is mostly used in the quenching and tempering state to make parts for the machinery manufacturing industry. More than 0.6%C is high carbon steel, which is mostly used to make springs, gears, rollers, etc. According to the different manganese content, it can be divided into two steel groups: ordinary manganese content (0.25-0.8%) and higher manganese content (0.7-1.0% and 0.9-1.2%). Manganese can improve the hardenability of steel, strengthen ferrite, and improve the yield strength, tensile strength and toughness of steel. Usually, the mark "Mn" is added to the steel grade with high manganese content, such as 15Mn and 20Mn, to distinguish it from carbon steel with normal manganese content.

3. Classification by use

According to the use, it can be divided into carbon structural steel and carbon tool steel. Carbon tool steel has a carbon content of 0.65-1.35%. After heat treatment, it can obtain high hardness and high resistance. It is mainly used to manufacture various tools, cutting tools, molds and measuring tools (see tool steel). Carbon structural steel is divided into 4 grades according to the yield strength of steel: Q195, Q215, Q235, Q275. Each grade is divided into A, B, C, and D grades due to different quality. Some have four grades, and some have only one; in addition, there are differences in the deoxidation method of steel smelting. Deoxidation method symbol: F——Rimming steel Z——Steel TZ——Special steel

Mechanical properties

This type of steel mainly focuses on mechanical properties, so its grade reflects its mechanical properties, represented by Q+number, where "Q" is the Chinese pinyin initials of the word "Q" for yield point, and the number represents the yield point value, for example, Q275 means the yield point is 275Mpa. If the letters A, B, C, and D are marked after the grade, it means that the quality grade of the steel is different, the amount of S and P decreases in turn, and the quality of the steel increases in turn. If the letter "F" is marked after the grade, it is rimming steel, "b" is marked for semi-steel, and no "F" or "b" is marked for steel. For example, Q235-A·F means A-grade rimming steel with a yield point of 235Mpa, and Q235-C means C-grade steel or special steel with a yield point of 235Mpa.

Mass fraction

Carbon structural steel is generally not heat treated, but used directly in the supply state. Usually, Q195, Q215, and Q235 steels have low carbon mass fractions, good welding performance, good plasticity and toughness, and certain strength. They are often rolled into thin plates, steel bars, welded steel pipes, etc., and are used in structures such as bridges and buildings and in the manufacture of ordinary screws, nuts and other parts. Q255 and Q275 steels have slightly higher carbon mass fractions, higher strength, better plasticity and toughness, and can be welded. They are usually rolled into profiled steel, bars and steel plates as structural parts and for the manufacture of connecting rods, gears, couplings, pins and other parts of simple machinery.

Company Introduction:

Qinhuangdao Zhongwei Precision Machinery Co., Ltd. was established in 1997. It is a professional manufacturer of rough forgings engaged in the manufacture and processing of automotive parts, marine gearbox accessories, and engineering machinery accessories. It can forge materials such as copper alloys, titanium alloys, aluminum alloys, carbon steel, stainless steel, and high-temperature alloys. The company covers an area of ​​more than 10,000 square meters and a standard plant of 5,000 square meters. It has a complete set of advanced production technologies and equipment from mold design, development, parts manufacturing and processing. It has several die forging production lines, mainly 4000T, 2500T, 1600T, 1000T, and several auxiliary production lines. The annual output is 15,000 tons. It is exported to more than 20 countries and regions including Germany, the United States, the United Kingdom, France, Russia, etc.