C86300 Manganese Bronze

C86300 Manganese Bronze

758 MPa min
TENSILE STR
3.0–7.5%
ALUMINUM
ASTM B505
SPEC STD
C86300 manganese bronze, also known as high-strength manganese bronze or SAE 430B, is a non-heat-treatable copper-zinc-aluminum alloy supplied as continuous-cast and sand-cast bar. It delivers high strength and outstanding wear resistance for heavy loads and slow speeds, making it ideal for gears, cams, large valve stems, and heavy-duty bearings.
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Product Overview

C86300 is a high-strength manganese bronze whose properties come from 22.0–28.0% zinc, 3.0–7.5% aluminum, and 2.5–5.0% manganese in a copper-rich matrix, with 2.0–4.0% iron for grain refinement. It is a non-heat-treatable casting alloy produced as continuous-cast bar (ASTM B505), centrifugal cast (ASTM B271), sand cast (ASTM B22 / B147), and sand-cast valve parts (ASTM B763). The aluminum and iron combination gives it hardness and wear resistance well above ordinary brasses.

In the as-cast condition C86300 reaches a minimum tensile strength of 758 MPa (110 ksi), yield of 427 MPa (62 ksi), elongation of 14%, and a Brinell hardness of 225. It is engineered for slow-speed, heavy-load bearings, screw-down nuts, and forming dies where strength and anti-galling behavior matter more than machinability (machinability rating only 8 versus free-cutting brass = 100). Coated-metal-arc welding is good, but soldering, brazing, and gas-shielded arc welding are poor.

Linsy Copper supplies C86300 manganese bronze as continuous-cast solid and hollow bar with low-MOQ custom diameters and lengths (typical lead time 10–60 days), in-house CNC machining to bearing tolerances, an MTR/MTC for every order, and optional SGS testing on request. Contact our Shenzhen team for a quotation within one hour.

Key Features

Very high strength (758 MPa min) with Brinell 225 hardness for heavy loads
Outstanding wear and anti-galling resistance at slow speeds
Good corrosion resistance with 7.83 g/cm³ density, lighter than steel
Non-heat-treatable casting alloy supplied as continuous, centrifugal, and sand cast
Reliable for screws, cams, and large valve stems under shock loading
Supplied to ASTM B505 / B22 / B147 / B271 in bar and custom shapes

Available Sizes

Copper Shape Thickness (mm) Width/Diameter (mm) Length (m)
Bar - Φ5-200 1-6
Wire - Φ0.05-10 Customize
Sheet 0.25-6 500-2500 1-6
Plate 6-200 200-3000 1-6
Strip 0.15-6 8-610 Customize
Tube OD: φ2-600; WT:φ0.2-100mm - 1-6
Coil 0.15-6 3-1250 1-6
Foil < 0.15 10-1350 Customize
Profile Customized Customize Customize

* Custom sizes available upon request. Contact our sales team for special requirements.

Technical Specifications

Precision data for engineering decisions. All values tested per ASTM standards.

Applications & Use Cases

Proven solutions across diverse industries. From aerospace to marine environments.

Frequently Asked Questions

Find answers to common questions about our products, services, and ordering process

C86300 is a heavy-duty manganese bronze for slow-speed, high-load service: bushings and sleeve bearings, gears, cams, screw-down nuts, large valve stems, hydraulic cylinder parts, and marine hardware. It is chosen where strength and wear resistance outweigh machinability.
No. C86300 is a non-heat-treatable casting alloy; its properties come from composition and casting method, not heat treatment. Strength is fixed by the as-cast condition, so section size and casting method should be specified up front.
Machinability is rated only 8 (free-cutting brass = 100), so it machines slowly and wears tools. Coated-metal-arc welding is good, but soldering, brazing, and gas-shielded arc welding are poor — assembly is usually by machining and mechanical fit.
ASTM B505 covers continuous castings, B271 centrifugal, B22 and B147 sand castings, and B763 sand-cast valve parts. The values quoted here follow ASTM B505 continuous cast; sand-cast minimums are similar.
Linsy Copper supplies C86300 as continuous-cast solid and hollow bar at low MOQ with a typical lead time of 10–60 days, ships an MTR/MTC with every order, and offers optional SGS testing on request.
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