Monel

Monel 400 Round Bar & Rod

High-Strength Nickel-Copper UNS N04400 Cold Drawn, Bright Polished, Forged & Pump Shaft Quality (PSQ) Bars

Grade Monel 400 / Alloy 400 (UNS N04400, Werkstoff 2.4360, W.Nr 2.4361, NiCu30Fe, AWS 040)
Standard ASTM B164, ASME SB164, ASTM B564, ASME SB564, AMS 4675, AMS 4730, BS 3076 (NA 13), DIN 17752, NACE MR0175 / ISO 15156
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Product Overview

Om Export India Pvt Ltd is a premier manufacturer, stockist, and global exporter of high-integrity Monel 400 Round Bars, Rods, and Hexagon Bars (ASTM B164 / ASME SB164 / UNS N04400 / Werkstoff 2.4360). Monel 400 is a solid-solution nickel-copper alloy formulated with a minimum 63% Nickel and 28% to 34% Copper. It provides outstanding resistance to high-velocity seawater, non-oxidizing mineral acids, hydrofluoric acid alkylation media, and aggressive alkaline solutions.

Our comprehensive inventory includes cold-drawn precision ground bars, centreless ground Pump Shaft Quality (PSQ) bars, hot-rolled pickled rounds, and heavy open-die forged bars up to 800 mm in diameter. Conforming to ASTM B164 Class A/B, ASME Section II, AMS aerospace specifications, and NACE MR0175 sour service standards, Monel 400 bar stock retains mechanical toughness from cryogenic conditions up to 1000°F (538°C) and can only be hardened by cold mechanical working.

  • Severe Marine & Caustic Resistance: Immunity to chloride-induced stress corrosion cracking, cavitation, and marine fouling in turbulent brackish environments.
  • Precision Machining Tolerances: Available in H8, H9, H11, and K9–K12 ISO tolerance classes with high straightness and defect-free surface finishes.
  • Cryogenic to High-Temperature Toughness: Retains high tensile strength and impact ductility at sub-zero temperatures with continuous stability up to 538°C.

Key Features

  • Marine Corrosion Immunity: High resistance to turbulent sea flow, pitting, cavitation, and marine biofouling.
  • Hydrofluoric & Alkaline Resistance: Resistant to non-aerated hydrofluoric acid and boiling caustic soda solutions across all concentrations.
  • Cryogenic Ductility: Exceptional impact toughness and zero embrittlement down to cryogenic temperatures (-200°C).
  • Dimensional Precision: Precision ground finishes offering tight h8/h9 diametrical tolerances and high straightness for dynamic rotating shafts.
  • Stress Corrosion Resistance: Immunity to chloride-induced stress corrosion cracking in high-pressure offshore and chemical environments.
  • Machinability & Weldability: Readily weldable using AWS ERNiCu-7 filler metals and easily machined using high-speed tooling with rigid tool setups.

Product Specifications

Specification Parameter Standard Specification / Technical Value
Round Bar Diameter Range 3.0 mm to 800.0 mm (1/8" to 32" Diameter / M6 to M48)
Hexagonal Bar Size Range 2.0 mm to 100.0 mm Across Flats (A/F)
Square & Flat Bar Range Square: 4x4 mm to 100x100 mm | Flat: Thk 2–100 mm x Width 10–500 mm
Hollow Bar Size Range Outer Diameter: 20 mm to 500 mm | Wall Thickness: 3 mm to 80 mm
Manufacturing Standards ASTM B164, ASME SB164, ASTM B564, AMS 4675, BS 3076, DIN 17752
Dimensional Tolerances ISO h8, h9, h10, h11, h12, h13, k9, k10, k11, k12 or ASTM A484 Class
Delivery Conditions Cold Drawn & Annealed, Hot Rolled & Pickled, Centreless Ground & Polished, Rough Turned, Forged
Surface Finishes Bright Polished, 240 Grit Belt Polished, Matt Finish, Hairline, Black Mill Finish, Peeled

Dimensions & Sizes

Diameter (Inches / mm) Section Area (mm²) Weight per Meter (kg/m) Weight per Foot (lb/ft) Standard Length Availability
1/4" (6.35 mm) 31.67 mm² 0.28 kg/m 0.19 lb/ft 3000 mm / 10 ft
3/8" (9.53 mm) 71.26 mm² 0.63 kg/m 0.42 lb/ft 3000 mm / 10 ft
1/2" (12.70 mm) 126.68 mm² 1.11 kg/m 0.75 lb/ft 3000 mm / 6000 mm
5/8" (15.88 mm) 197.93 mm² 1.74 kg/m 1.17 lb/ft 3000 mm / 6000 mm
3/4" (19.05 mm) 285.02 mm² 2.51 kg/m 1.69 lb/ft 3000 mm / 6000 mm
7/8" (22.22 mm) 387.95 mm² 3.41 kg/m 2.29 lb/ft 3000 mm / 6000 mm
1" (25.40 mm) 506.71 mm² 4.46 kg/m 3.00 lb/ft 3000 mm / 6000 mm
1-1/4" (31.75 mm) 791.73 mm² 6.97 kg/m 4.68 lb/ft 3000 mm / 6000 mm
1-1/2" (38.10 mm) 1140.09 mm² 10.03 kg/m 6.74 lb/ft 3000 mm / 6000 mm
1-3/4" (44.45 mm) 1551.79 mm² 13.66 kg/m 9.18 lb/ft 3000 mm / 6000 mm
2" (50.80 mm) 2026.83 mm² 17.84 kg/m 11.99 lb/ft 3000 mm / 6000 mm
2-1/2" (63.50 mm) 3166.92 mm² 27.87 kg/m 18.73 lb/ft 3000 mm / 6000 mm
3" (76.20 mm) 4560.37 mm² 40.13 kg/m 26.97 lb/ft 3000 mm / 6000 mm
3-1/2" (88.90 mm) 6207.17 mm² 54.62 kg/m 36.71 lb/ft 3000 mm / 6000 mm
4" (101.60 mm) 8107.32 mm² 71.34 kg/m 47.94 lb/ft 3000 mm / 6000 mm
5" (127.00 mm) 12667.69 mm² 111.48 kg/m 74.91 lb/ft 2000 mm to 6000 mm
6" (152.40 mm) 18241.47 mm² 160.52 kg/m 107.87 lb/ft 2000 mm to 6000 mm
8" (203.20 mm) 32429.28 mm² 285.38 kg/m 191.77 lb/ft 1000 mm to 4000 mm
10" (254.00 mm) 50670.75 mm² 445.90 kg/m 299.64 lb/ft 1000 mm to 3000 mm
12" (304.80 mm) 72965.88 mm² 642.10 kg/m 431.48 lb/ft 1000 mm to 3000 mm

Chemical Composition

Element ASTM B164 / UNS N04400 (%) DIN 2.4360 / NiCu30Fe (%)
Nickel (Ni + Co) 63.00 Min 63.00 Min
Copper (Cu) 28.00 – 34.00 28.00 – 34.00
Iron (Fe, Max) 2.50 2.50
Manganese (Mn, Max) 2.00 2.00
Carbon (C, Max) 0.30 0.15
Silicon (Si, Max) 0.50 0.50
Sulfur (S, Max) 0.024 0.020

Mechanical Properties

Material Condition / Form Tensile Strength (MPa / ksi) Yield Strength 0.2% Offset (MPa / ksi) Elongation in 2 in. (%) Hardness (Rockwell / Brinell)
Annealed (Hot Rolled / Cold Drawn) 480 – 620 MPa (70 – 90 ksi) 195 – 345 MPa (28 – 50 ksi) 35% – 50% 65 – 80 HRB (110 – 150 HBW)
Cold Drawn / Stress Relieved 585 – 760 MPa (85 – 110 ksi) 380 – 585 MPa (55 – 85 ksi) 15% – 30% 85 – 98 HRB (160 – 220 HBW)
Spring Temper / Hard Drawn 850 – 1050 MPa (123 – 152 ksi) 690 – 930 MPa (100 – 135 ksi) 2% – 10% 20 – 30 HRC
Physical Density & Melting Point Density: 8.80 g/cm³ (0.318 lb/in³) Melting Point: 1350°C (2460°F) Modulus of Elasticity: 105–120 kN/mm²

Standards & Specifications

Governing Organization Standard Designation Scope & Product Type
ASTM / ASME ASTM B164 / ASME SB164 Standard Specification for Nickel-Copper Alloy (UNS N04400) Rod, Bar, and Wire
ASTM / ASME ASTM B564 / ASME SB564 Standard Specification for Nickel Alloy Forgings and Forging Stock
Aerospace Material Spec AMS 4675 / AMS 4730 Nickel-Copper Alloy Bars, Forgings, and Wire for Aerospace Engineering
British Standard (BS) BS 3076 (NA 13) / DTD 204B Specification for Nickel and Nickel Alloys: Bars, Rods, and Sections
German Standard (DIN) DIN 17752 / Werkstoff 2.4360 Wrought Nickel and Nickel-Copper Alloy Rods and Bars (NiCu30Fe)
Oil & Gas Standard NACE MR0175 / ISO 15156 Petroleum and Natural Gas Industries — Materials for use in H2S-containing environments

Applications

Monel 400 round bars, hex bars, and forgings are utilized across critical marine, energy, and process industries:

  • Marine Propulsion & Shafting: Pump shafts, propeller shafts, rudder stocks, marine drive mechanisms, and winch shafts using PSQ (Pump Shaft Quality) ground bars.
  • Chemical Processing Hardware: Valve stems, pump impellers, mixer shafts, thermowell assemblies, and reactor agitator shafts exposed to sulfuric and hydrofluoric acids.
  • Petroleum Refining & Offshore Drilling: Downhole drill collars, sour gas wellhead components, valve trim, well completion tools, and offshore platform fasteners.
  • Industrial Fasteners & Machined Parts: High-tensile studs, hex bolts, threaded rods, nuts, washers, and precision CNC screw-machined fittings.
  • Power & Desalination Utilities: Boiler feed pump shafts, deaerator valve stems, high-pressure brine pump rotors, and heat exchanger tie rods.

Frequently Asked Questions

Q1: What is Pump Shaft Quality (PSQ) Monel 400 round bar?
PSQ Monel 400 bars are cold finished and centreless ground to stringent diameter tolerances (ISO h8/h9) and strict straightness specifications (within 0.001 to 0.002 inches per foot), eliminating vibration and wear in high-speed pump and propeller shaft duties.

Q2: Can Monel 400 round bars be hardened by heat treatment?
No, Monel 400 is a single-phase solid-solution alloy and cannot be precipitation hardened by thermal treatment. Mechanical strength and hardness can only be increased via cold rolling or cold drawing followed by stress-relief heat treatment at 300°C–320°C.

Q3: How does Monel 400 bar compare to Monel K500 bar?
While Monel 400 offers solid-solution corrosion resistance and moderate strength, Monel K500 contains added Aluminum and Titanium, allowing precipitation age-hardening to achieve approximately double the yield strength (up to 790 MPa) while retaining comparable corrosion resistance.

Q4: What surface finishes are available for Monel 400 rods and bars?
We supply Monel 400 bars in Black (hot-rolled/forged), Pickled, Rough Turned, Centreless Ground & Polished, 240 Grit Belt Polished, Bright Drawn, and Mirror Finish.

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