Nimonic 75 Round Bars

Nimonic 75 Round Bars Supplier in Mumbai, India

Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier in Mumbai, India. We supply Nickel‑Chromium Alloy 75 bars accompanied by EN 10204 3.1 mill test certificates and positive material identification (PMI) reports. Nimonic 75 round bar delivers oxidation resistance up to 1000°C combined with medium-strength performance for gas turbine, furnace, and heat-treatment applications. This 80/20 nickel-chromium alloy (UNS N06075, W.Nr. 2.4951 / 2.4630) gains moderate creep strength from controlled titanium (0.20-0.60%) and carbon (0.08-0.15%) additions that form stable carbides within the matrix. Alloy 75 is a solid-solution-strengthened grade. It does not respond to age hardening, which simplifies processing and makes it ideal for welded fabrications. In the solution-treated condition, where Nimonic 75 bar is heated at 1050°C for 30–60 minutes and then air cooled, it provides a tensile strength of about 650 MPa (94 ksi) and a proof stress of 240 MPa (35 ksi), with at least 25% elongation and a maximum hardness of 230 HB. At 800°C, the tensile strength reduces to around 200 MPa, but the material remains ductile, so it is well suited for components operating at moderate stress levels in the 600–900°C temperature range. Weldability is excellent; no post-weld heat treatment is normally required per ASTM B637 and BS HR5. Bar stock is available in diameters from 6 mm up to 300 mm and in standard lengths from 1 to 6 metres, supplied in accordance with BS HR5, BS HR504, DIN 17752, and ISO 9723. Products can be ordered as round bar, rod, hex bar, flat bar, rectangular bar, or forged bar, offered in hot-rolled, cold-drawn, and centreless-ground finishes to suit machining and fabrication requirements.

Nimonic 75 Round Bar Specifications

Specifications for Nimonic 75 bars consist of standards, dimensions, forms, conditions, finishes, tolerances, and other key details. Check the table given below:

Grade	Nimonic 75 / Alloy 75
Standards	BS HR5, BS HR504, DIN 17752, ISO 9723, ASTM B637
Forms	Round Bar, Rod, Hex Bar, Flat Bar, Rectangular Bar, Forged Bar
Diameter	6 mm – 300 mm
Length	1000 – 6000 mm, cut-to-length
Condition	Solution Treated, Hot Rolled, Cold Drawn, Forged
Finish	Black, Bright, Polished, Centreless Ground
Tolerance	h9, h11, or customer specification
Hardness	≤230 HB (solution treated)

Also compliant with AECMA PrEN2306 and PrEN2307 for aerospace bar procurement.

Nimonic 75 vs Nimonic 80A - Selecting the Right Bar Grade

Selection comparison:

Parameter	Nimonic 75	Nimonic 80A
Strengthening	Solid Solution	Precipitation (γ′)
Max Service Temp	~1000°C (oxidation)	~815°C (creep)
Tensile Strength (RT)	650 MPa	1000+ MPa (aged)
Weldability	Excellent, no PWHT	Good, ST before welding
Typical Bar Use	Furnace fixtures, sheaths	Turbine blades, fasteners

Specify Nimonic 75 when weldability and oxidation resistance matter more than peak strength. Choose Nimonic 80A when creep-rupture performance under sustained loading above 600°C is the primary design driver.

Chemical Composition of Nimonic 75 Bar & Rod

Chemical composition limits for Nimonic 75 alloy as defined in the BS HR5 standard and UNS N06075 specifications:

Nickel (Ni)	Chromium (Cr)	Titanium (Ti)	Carbon (C)	Iron (Fe)	Silicon (Si)	Manganese (Mn)	Copper (Cu)
Balance (≥72%)	18.0 – 21.0	0.20 – 0.60	0.08 – 0.15	5.0 max	1.0 max	1.0 max	0.5 max

The 80/20 nickel‑chromium base resists oxidation by forming a stable chromium oxide layer. Titanium and carbon create carbides that give moderate creep strength without the need for precipitation hardening.

Mechanical Properties of Nimonic 75 Round Bar

Mechanical property values of Nimonic 75 alloy after solution treatment at 1050°C, followed by air cooling, including strength and ductility:

0.2% Proof Stress	Tensile Strength	Elongation (4D gauge)	Reduction of Area	Hardness
240 MPa (35 ksi)	650 MPa (94 ksi)	≥25%	≥45%	≤230 HB

At 800°C, tensile strength drops to ~200 MPa, but ductility is retained. This makes Nimonic 75 bar suitable for moderate-stress components in the 600-900°C range, where oxidation resistance is the primary design driver.

Physical Properties of Nimonic 75 Round Bar

Main physical properties of UNS N06075 alloy, including Nimonic 75 density, melting range, and key thermophysical data:

Property	Density	Melting Range	Elastic Modulus (20°C)	Specific Heat (20°C)	Thermal Conductivity (20°C)	Electrical Resistivity
Value	8.37	1340-1380	221	461	11.7	1.09
Unit	g/cm³	°C	GPa	J/kg·°C	W/m·K	µΩ·m

Nimonic 75 Bar Equivalent Grades

Alternative grade names and standards for Alloy 75 bar, including Werkstoff Nr. 2.4951, 2.4630, and other international designations:

UNS	Werkstoff Nr.	DIN	GOST
N06075	2.4951, 2.4630	17752, NiCr20Ti	KhN78T

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Available Forms of Nimonic 75 Bar & Rod

Nimonic 75 bar forms for fabrication, machining, and high-temperature service:

Nimonic 75 Hot-Rolled Round Bar

Nimonic 75 Cold-Drawn Bar

Nimonic 75 Forged Bar

Nimonic 75 Hex Bar

Nimonic 75 Flat Bar

Nimonic Rectangular Bar

Nimonic 75 Hollow Bar

Nimonic 75 Rods

Hot Working, Cold Working & Heat Treatment of Nimonic 75 Bar

Hot work at 1220-950°C. Forging, rolling, and upsetting are standard practices within this range. Annealed Nimonic 75 has good ductility; rapid strain hardening allows large cold reductions without rupture in the drawn bar. Solution treated at 1050°C for 30-60 minutes, air cooled. No ageing treatment is required. Weld by TIG, MIG, MMA, or submerged-arc using matched consumables. No post-weld heat treatment is normally needed. Weld decay does not occur in the HAZ.

Industries & Applications Using Nimonic 75 Round Bars

Nimonic 75 round bars serve critical high-temperature duties across gas turbine, furnace, nuclear, petrochemical, and power-generation industries worldwide.

Gas Turbine & Aerospace: Turbine blade roots, combustion liners, flame tubes, and exhaust collector rings at 600–900°C.
Furnace & Heat Treatment: Furnace rollers, radiant tubes, muffle fixtures, and thermocouple protection tubes.
Nuclear: Used for reactor internals and control rod parts; the low cobalt content helps reduce Co-60 activation.
Petrochemical: Used for catalyst support grids and reformer tube hangers in ethylene plants.
Power Generation: Used for boiler baffles and supports for superheater tubes in coal- and gas-fired power stations.

How to Order Nimonic 75 Round Bar

To order Nimonic 75 Round Bar, follow these 9 important details:

Product Form (Round Bar, Rod, Hex Bar, Flat Bar, Forged Bar)
Diameter / Cross-section (specify mm or inch)
Length (standard or cut-to-length)
Condition (Solution Treated, Hot Rolled, Cold Drawn, Forged)
Finish (Black, Bright, Polished, Centreless Ground)
Tolerance (h9, h11, or custom)
Standard (BS HR5, BS HR504, DIN 17752)
Test Certificates (EN 10204 3.1 / 3.2, PMI, Ultrasonic)
Quantity (kg or pieces)

Frequently Asked Questions

What Standard Covers Nimonic 75 Round Bar?

BS HR5 and BS HR504 (British Standards), DIN 17752 (German), ISO 9723 (International), AECMA PrEN2306/2307 (aerospace), and ASTM B637.

Can Nimonic 75 Round Bar Be Used Above 900°C?

Yes for non-loaded or lightly loaded conditions (furnace fixtures, thermocouple sheaths) up to ~1000°C. For sustained stress above 800°C, consider Nimonic 80A or 90 bar.

Is Nimonic 75 Bar Precipitation Hardenable?

No . Alloy 75 is solid-solution strengthened. It does not respond to age hardening. Heat treatment consists only of solution annealing at 1050°C, air cool.

What is the Difference Between Nimonic 75 and Inconel 600 Bar?

Yes. Nicorex Alloys supplies cut-to-size Alloy 59 sheet and plate by plasma, waterjet, or shearing. Cut-to-length from coil is available for strip.

Does Nimonic 75 Require Post-Weld Heat Treatment?

Normally no. Weld decay does not occur in the HAZ. If the component contacts caustic soda, fluosilicates, or mercury salts, stress relief at 1050°C may be beneficial.

What Diameter Range is Available?

6 mm to 300 mm. Cold-drawn bar up to ~80 mm. Forged bar up to 300 mm or larger on request. Standard lengths: 1-6 metres.