Wuxi Aotian Steel Wire has long been a stable supplier of 20MNB4 boron alloy cold‑heading steel, targeting the premium fastener, precision cold‑heading and high‑strength component markets with consistent‑performance, reliable‑quality wire rods and coils for customers worldwide.
20MNB4 is a manganese‑boron alloy steel conforming to DIN EN 10269 / EN 10263, material number 1.5525.Chemical composition is precisely controlled: C 0.18–0.23%, Mn 0.90–1.20%, B 0.001–0.005%, with strict impurity limits to ensure stable hardenability, uniform heat treatment and low cold‑heading cracking rate. After heat treatment, the grade achieves an excellent balance of high strength and good toughness, with tensile strength ≥580MPa and reduction of area ≥60%, widely used for high‑strength bolts, nuts, pins, gear blanks and complex cold‑headed parts. Compared with conventional Cr‑Ni steels, 20MNB4 offers higher cost‑performance and lower cost, reliably replacing grades such as 20CrNi and 12CrNi3 to help customers reduce costs and improve efficiency.
Adopting the mature process of clean steel melting + continuous casting & direct rolling + precise spheroidizing annealing, Aotian's 20MNB4 features uniform microstructure, high spheroidization rate, excellent surface quality and stable dimensional accuracy, with low batch‑to‑batch variation. Proven by years of market application, it fully meets strict premium customer requirements for cold‑heading performance and consistency.
With years of expertise in high‑quality cold‑heading steel and alloy structural steel, Aotian continues to support domestic and international customers with reliable quality and professional technical service for material upgrading and product innovation in automotive, construction machinery, energy and rail transportation sectors.
