Nickel Molybdenum rod
Products Features
Last month, when I went to a pesticide factory for after-sales, the workshop director pointed to a mixing shaft that had been used for 6 years and complained to me: "The 316L shaft used to be broken inside in less than three years, and it cost me more than 100,000 yuan to stop production and replace it once. Now this nickel-molybdenum rod (B-3 grade) has zero failures since it was put into production, and the surface is as smooth as new." I squatted down and touched it, and there was no trace of erosion-this is the real performance of nickel-molybdenum rods in reducing strong acids.
It is not an upgraded version of any stainless steel bar, but a high-end corrosion-resistant alloy bar specially designed for those key components that "spin up and soak in acid".
Nickel-molybdenum rods (typical grade Hastelloy B-2/B-3) are positioned in the narrow track of * * high-end mechanical parts in the chemical, petrochemical, and pharmaceutical industries * *. It focuses on the ultra-high molybdenum alloy system of * * Ni ≥ 65% and Mo 26-30% * *, which specifically solves the problems of 316L "unable to withstand concentrated hydrochloric acid", dual-phase steel "easy to brittle at high temperature", C-276 "although all-around but higher cost" pain point.
Almost "immune" to corrosion resistance to reducing acids
Any concentration of hydrochloric acid (including boiling state), sulfuric acid, phosphoric acid, hydrofluoric acid, or mixed acid, it can reduce the corrosion rate to less than 0.05-0.1 mm/year. The core relies on a dense protective film formed by high molybdenum to directly block chloride ions. As soon as 316L encounters more than 20% concentrated hydrochloric acid, it "bubbles and perforates", but the nickel-molybdenum rod is as stable as an old dog.
Both mechanical strength and toughness are taken into account, suitable for rotary parts
At high temperatures of 400-600 ℃, the strength rate is high, the elongation rate is ≥ 40%, and the ability to resist stress corrosion cracking is strong. When doing stirring shaft and pump shaft, it is acid-resistant and fatigue-resistant, and will not be "broken when turning around" like ordinary stainless steel.
Welding and processing friendly
B-3 low-carbon improved version, almost no intergranular corrosion after welding, can be done with TIG welding on site, no need to go to great lengths for heat treatment. The machining performance is also good, turning, milling, and drilling are all easy.
Products Parameter
|
Comparison Item |
Nickel-Molybdenum Rod (Hastelloy B-2/B-3) |
316L Stainless Steel |
Hastelloy C-276 |
|
Main Composition |
Ni ≥65%, Mo 26–30%, low Cr (<2%) |
Fe-based, Cr 16–18%, Ni 10–14%, Mo 2–3% |
Ni 57%, Mo 15–17%, Cr 14.5–16.5%, W 3–4.5% |
|
Resistance to Reducing Acids |
★★★★★ (Superior – corrosion rate <0.1 mm/year even in boiling concentrated HCl) |
★★ (Fair – rapid corrosion in concentrated HCl) |
★★★★ (Good) |
|
Resistance to Oxidizing/Mixed Acids |
★★ (Poor – not recommended in strong oxidizing environments) |
★★★ (Good) |
★★★★★ (Excellent – widest application range) |
|
Resistance to Pitting/Crevice Corrosion |
Corrosion ★★★★ (Excellent) |
★★★ (Good – prone to pitting in chlorides) |
★★★★★ (Excellent – preferred for seawater/high Cl⁻) |
|
High-Temperature Strength & Elongation |
Excellent strength retention at 400–600°C, elongation ≥40%, superior fatigue resistance |
Noticeable drop above 400°C |
Best performance up to 800°C |
|
Weldability / Machinability |
Good (B-3 low-carbon design – almost zero intergranular corrosion, excellent turning, milling & drilling) |
Excellent |
Excellent |
|
Typical Applications |
Reactor agitator shafts, HCl/sulfuric acid pump shafts, valve stems, fasteners, rotating parts in acidic oil & gas service |
General chemical piping and standard valve components |
Flue gas desulfurization pump shafts, hydrometallurgy rotating parts, mixed oxidizing/reducing media shafts |
|
Application Summary |
King of pure reducing acids + moving parts – best choice for extreme reducing conditions where components must rotate or stir |
Best choice for cost-sensitive mild corrosion environments |
Most versatile corrosion resistance |
Application Advantages
Pump shaft and centrifugal pump key parts
phosphoric acid concentration, chlor-alkali production of the acid pump shaft. High-speed rotation and strong acid erosion, 316L leaks in three months, and the nickel-molybdenum rod directly extends the maintenance cycle to more than two years.
Oil and gas acidity
pump shafts and fasteners in moisture treatment equipment containing H ₂ S and HCl. In the past, dual-phase steel was stress-cracked for two years, but now it is directly used on nickel-molybdenum rods.
Pharmaceutical and environmental protection equipment
stirring rods for high-purity intermediate reactors, and pickling column internals for hazardous waste treatment. Requires zero metal ion pollution, and the high purity characteristics of nickel-molybdenum rods are just right.
Products Description
Finally want to say
Nickel-molybdenum rods have never been the cheapest option, but they are the most reliable "long-life sports parts". When high-concentration hydrochloric acid, boiling sulfuric acid, or high-temperature reducing media appear in your working conditions, and the parts are still rotating, moving, and grinding, don't carry 316L hard directly; instead, put nickel-molybdenum rods, which can reduce detours.
If you are choosing a shaft rod for new equipment, or if you have a headache from the corrosion of the shaft parts of old equipment, send us the working condition parameters (media concentration, temperature, speed, pressure). We don't sell "omnipotent sticks", only "symptomatic sticks". The professional team helps you match the grade, diameter, tolerance, and surface state in place at one time, so that the equipment can truly realize "one-time investment, worry-free".
After-Sales Service
Nickel-molybdenum rod is not just a metal rod; it is the confidence to make the production line shut down less and make more money.
Need a quote? Need sample testing? Need machining or welding instruction? Feel free to contact us for a one-on-one chat. In the road of the chemical industry, safety comes first, peace of mind comes second, and making money comes third. Nickel molybdenum rods will help you get the first two things done first.
NAME
Ava
18291778622
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