Hot Forging Process for High-Quality 38crni3MOV Steel Shafts

Jiangsu Weirun Forging Co., Ltd.
Founded in 2001, Jiangsu Weirun Forging Co., Ltd. represents a trailblazing entity in China's alloy steel smelting and forging landscape. Emerging from the strategic union of Jiangsu Longtai Alloy Technology Co., Ltd. and Jiangsu Xinya New Materials Co., Ltd., our company stands as a beacon of one of the nation's pioneering manufacturers of an extensive range of forged products. Our enduring legacy is intricately woven with threads of innovation and an unwavering commitment to excellence.
Commanding a leading position in alloy steel smelting, electroslag remelting, forging, and mold manufacturing, Jiangsu Weirun has sculpted a comprehensive industrial chain through years of dynamic development. Our seamless operations span the realms of material recycling, smelting, electroslag casting, forging, and precision mold machining, making waves on both domestic and global stages. Our pledge is to provide unparalleled quality and service, setting benchmarks in the industry.
Encompassing a sprawling 60,000 square meters, our cutting-edge facility is outfitted with advanced electroslag furnaces, including three 1-ton units, one 3-ton, and a formidable 10-ton unit. Our forging capability is bolstered by two 2-ton air hammers, a 1-ton air hammer, and a 0.75-ton air hammer, along with mechanized electro-hydraulic hammer lines of 5 and 8 tons. State-of-the-art mechanical processing and heat treatment equipment, combined with spectrometers and a variety of testing devices, fortify our impressive industrial output valued at 300 million yuan. Supported by fixed assets of 153 million yuan and a talented team of over 200, including 20 technical experts, we proudly rank among Danyang City's top fifty leaders in sales and tax contributions.
To propel our growth trajectory, Jiangsu Weirun has adopted a strategic approach to talent acquisition, partnering with eminent domestic universities and research institutions to drive continuous innovation. Our relentless quest for technological excellence has resulted in 5 national patents for innovative breakthroughs and 3 utility model patents, underscoring our dedication to pioneering advancements.
With an impressive annual production capacity exceeding 30,000 tons of steel ingots and a forging capacity of 15,000 tons, Jiangsu Weirun is devoted to catering to a diverse spectrum of industries such as wind power, chemical engineering, machinery, automotive, shipbuilding, power generation, metallurgy, mining, and petrochemicals. Guided by the mantra of 'pursuing excellence and building a world brand,' we remain resolute in aligning with international markets and standards, having attained prestigious certifications like ISO9001, China CCS, France BV, and Germany TUV. As a distinguished provider of forged products, Weirun maintains an unwavering focus on professional expertise, consistently delivering exceptional quality and service to our esteemed clientele.

• What is the difference between forging and casting?

  Forging: It is the process of transforming a solid from one shape to another. Casting: It is the process of transforming a shapeless liquid metal into a solid with a shape. The so-called casting is the process of casting molten metal into a model to obtain a casting. The casting profession focuses on the metal melting process and the control of processes during the casting process. Forging is a plastic forming process in the solid state, which can be divided into hot processing and cold processing. Forgings include extrusion, drawing, roughening, punching, and so on. Casting is a solid liquid solid process, while forging is a solid to solid process where a solid can change its shape into another shape at high temperatures. There are still differences in the shape process and process of the two.

• How to choose high-quality forgings?

  In the quality inspection of forgings, there are mainly external observation methods and internal inspection methods. The appearance method, as the name suggests, is to observe the appearance of the product, such as the shape, geometric dimensions, surface condition, etc. of the forging, in order to understand whether it meets the standards and whether there are external defects. Specifically, it is to check whether the external dimensions of the forging meet the specifications and whether there are defects on the surface, such as cracks, wrinkles, bubbles, indentations, pits, impurities, scratches, etc. on the surface of the forging. Internal testing mainly involves analyzing the chemical composition, macroscopic and microscopic structures, and mechanical properties of forgings. This inspection process requires the use of specialized instruments for high magnification inspection, with the aim of checking for any phenomena such as fractures and shrinkage within the forging, as well as defects such as dendrites and white spots, disordered flow lines, and throughflow. It also includes the tensile strength, ductility, hardness, plasticity, and heat resistance temperature of the forging.

• What are the characteristics of the forging process for blank forgings?

  The forging process of circular forgings mainly consists of the following processes: pier roughening, elongation, punching, and expanding. The difference between free forging and ring rolling processes is mainly in the process of expanding holes. In the production of ring forgings, free forging is usually used to expand the hole with a horse screw, while ring rolling is mainly used to expand the hole with rolling.