415 (trade name F6NM) is ultra-low carbon Ni-Mo alloyed martensitic stainless steel bright bar. Carbon ≤0.05%, Cr12.0~14.0%, Ni3.5~5.0%, Mo0.3~0.7%. After heat treatment, microstructure consists of martensite matrix + 5~20% retained austenite, strongly magnetic.

Chemical element content (%)

Specification：1.00~300.00mm

Application:It is mainly used to manufacture hydropower turbine blades & runner mandrels, sour oil & gas wellhead valve stems for offshore platforms, low-temperature feedwater pump shafts for power plants, medium-low temperature desulfurization heat exchange flanges for waste incineration, coastal low-pressure circulating cooling water fasteners, low-temperature heat exchange tooling for solar thermal power stations, valve bars for chloride-free fresh water chemical reactors, standard parts for low-temperature oil & gas gathering pipelines, valve bodies for mild chloride wastewater treatment, connectors for large welded hydropower pressure structures, etc.
Widely applied in medium & large hydropower units, offshore oil & gas platforms, power plant low-temperature circulating water systems, waste heat boilers for waste incineration, coastal low-pressure fresh water cooling facilities, solar thermal low-temperature heat exchange equipment, sulfur-containing oil & gas pipelines and complete municipal wastewater treatment plants.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production with dual online spectral & metallographic inspection strictly control C, Cr, Ni, Mo with qualified ultra-low carbon & Ni-Mo ratio. Balanced martensite-retained austenite ratio 40~80% ensures negligible batch fluctuation of low-temperature impact, SCC and pitting resistance for consistent mass production of hydropower and sour oil & gas welded pressure components.

2. Excellent surface quality: Dedicated high-precision cold drawing & centerless grinding lines produce smooth bars free of scale, scratches and pits with mirror finish. Smooth surface reduces H₂S & chloride pitting initiation risk to extend fatigue life under low-temperature cyclic corrosion service; secondary polishing is unnecessary for most precision machining.

3. Ultra-high dimensional accuracy: Precision cold rolling mills and automatic online dimension detectors narrow tolerance range with tiny single-bar deviation and strong batch uniformity. Unified part specifications during automatic mass production significantly raise finished yield and machining precision.

4. Rich product variety: According to market demand and customer's special requirements, customized products are provided to meet the use requirements under various complex working conditions, providing customers with more choices.

5. Perfect after-sales service: The perfect after-sales service system can respond to customer needs and feedback in a timely manner. For problems encountered by customers during use, technical support and solutions are provided to customers quickly.

We mainly engage in cold heading wire, bar, peeled bar, and profiled bar; our products cover 11 series and more than 300 grades, and we continue to develop a variety of professional steels. We can provide all-round solutions such as cold heading finishing line manufacturing and high-precision bright bar customization, and provide one-stop procurement services and package procurement solutions for global customers. The website displays some grades. If you don’t have the grade you need, please contact us by phone or email.