1、 Product Features

Customized forging round is a solid round steel made by plastic deformation of metal billets through forging technology. Compared with hot-rolled round steel and ordinary steel bars, it has significant performance advantages:

Internal organization is dense and uniform: using a fast forging process with a forging ratio of ≥ 4:1, the coarse grains in the cast state are crushed, the metal flow lines are complete and continuous, and internal defects such as pores and slag inclusions are completely eliminated. The grain size can reach level 6 or above, and the hydrogen content is strictly controlled at ≤ 2.0ppm. The coarse and fine values of non-metallic inclusions are both ≤ 2.0, laying the foundation for high strength and high toughness.

Excellent and balanced mechanical properties: Different materials of forged circles exhibit targeted mechanical characteristics, such as 34CrNiMo6 forged circles with tensile strength>890MPa, yield strength>770MPa, and elongation>30%; 40CrNiMoA has a forged round tensile strength of ≥ 980MPa, a yield strength of ≥ 835MPa, and an impact energy of ≥ 78J. It combines high strength, high toughness, and good hardenability, and can maintain uniform performance over a large cross-sectional range.

Strong customization adaptability: Customers can choose the basic process of electric furnace initial refining+external refining+vacuum degassing according to their needs, or customize the electric slag remelting process to improve purity; Supporting various heat treatment schemes such as normalizing, annealing, quenching+tempering, etc., the delivery status covers black skin, polishing, turning, annealing, etc. It can also provide precision machined products to directly meet downstream assembly needs.

Surface and precision controllable: The surface is smooth and wrinkle free, with a straightness of ≤ 3mm/1000mm. The diameter tolerance of the black skin state is controlled within -0/+3mm to -0/+5mm. After turning, the tolerance can be further reduced to -0/+2mm, which can meet the strict assembly requirements of precision machinery.

2、 Execution standards

The entire process of customized forging, from production to testing, follows strict standards to ensure stable quality:

Basic production and material standards: The mainstream implementation in China is GB/T 3077 "Alloy Structural Steel", which provides clear regulations on chemical composition and mechanical properties; Some high-end products can meet international standards such as ASTM A388 (American standard ultrasonic testing), SEP1921 (German standard ultrasonic testing grading), etc. The production enterprises have mostly passed ISO9001 quality management system certification, and some ship forging circles comply with international classification society specifications.

Non destructive testing standard: Ultrasonic testing is the core testing item, and GB/T 6402 is routinely implemented. The first, second, or third level testing level can be selected according to the requirements; Export products can be executed according to SEP1921 Class C/C, D/D, E/E levels, or ASTM A388 standards to ensure no hidden defects inside.

Special material special standard: Electromagnetic pure iron forging round, such as DT4E series, follows the electromagnetic pure iron special standard, and the magnetic properties need to be excited by annealing process; Nickel based alloys such as Z2 8NCDT42 and cobalt based high-temperature alloy GH159 comply with industry standards for corresponding alloy materials, with special definitions for high-temperature strength, creep resistance, corrosion resistance, and other indicators.

3、 Size specifications

Customized forging circles have a wide range of sizes and can be flexibly matched to different application scenarios:

Diameter range: The conventional production specifications range from Φ 80mm to Φ 1200mm, and some can achieve stable production of ultra large diameter forged circles with a diameter of Φ 1500mm; Special materials such as DT4E pure iron forged round cover with diameters ranging from 100mm to 350mm. Small batch customization can support non-standard small diameter specifications such as 70mm.

Length specifications: Usually delivered in variable lengths of 1-18 meters, customized lengths of 3 meters, 4 meters, etc. can be customized according to customer needs, with a maximum length of up to 18 meters, to meet the processing requirements of large structural components.

Tolerance control: The diameter tolerance of the black leather delivery state is -0/+3mm to -0/+5mm; the tolerance can be increased to -0/+2mm after turning processing; the straightness is strictly controlled within ≤ 3mm/1000mm to ensure the clamping accuracy and material utilization rate during subsequent machining.

Customized forged circles are widely used in fields such as automotive, wind power, aerospace, and heavy machinery due to their excellent performance, strict standard control, and flexible size customization capabilities. They have become the core material for manufacturing key components such as shafts, gears, and connecting rods.