High-Strength Oversized Phosphor Bronze Round Bars

Short Description:

Product Specifications
Name： Large Diameter Phosphor Bronze Round Bar
Standard： ASTM B139 / B103, UNS C51000 / C51900 / C52100, RoHS Compliant, REACH Compliant
Material： C51000 (Phosphor Bronze, 5% Tin), C51900 / C52100 (Higher Tin Variants)
Surface： Mill Finish, Optional Turned or Centerless Ground
Diameter： 50mm – 400mm (larger diameters on request)
Length： 1000mm – 6000mm (custom cut-to-length available)
Product Features: Excellent corrosion resistance especially in marine environments · High tensile and fatigue strength · Superior wear and abrasion resistance · Good electrical and thermal conductivity · Outstanding elasticity and spring properties · Low friction surface characteristics · Reliable performance under heavy mechanical loads
Application Field: Heavy-duty bearings and bushings, Marine propeller shafts and hardware, Pump and valve components, Gear and worm wheel blanks, Electrical connectors and springs, Industrial machinery parts, Hydraulic cylinder rods, Chemical processing equipment, Precision instruments

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Large Diameter Phosphor Bronze Round Bar – Process & Quality Assurance Statement
Our large diameter phosphor bronze round bars are engineered for demanding applications that require a combination of strength, durability, and resistance to harsh operating conditions.

Key process features

Manufacturing employs robust hot working techniques to deliver consistent material properties across substantial cross-sections:
●Alloy Melting: Premium ingots are carefully melted with controlled phosphorus and tin additions to achieve the desired temper.
●Continuous Casting: Sound billets are produced with slow cooling rates to ensure internal homogeneity.
●Hot Extrusion: High-tonnage presses extrude the heated billet into large round sections, refining the grain structure and improving density.
●Heat Treatment: Annealing cycles optimize hardness, ductility, and eliminate extrusion stresses.
●Straightening & Finishing: Mechanical straightening achieves excellent linearity; optional peeling or grinding enhances surface quality.
●Cutting & Protection: Precision sawing to specified lengths, with ends chamfered and surfaces protected against oxidation.
●Final Packaging: Bars are bundled securely and wrapped to prevent damage during international shipping.

Quality control system

● Full traceability from raw ingot batch to finished bar
● Mill test certificates provided with every order
● Retention of witness samples ≥3 years for third-party testing (SGS, BV, TÜV, etc.)
● 100% inspection of critical parameters:
• Chemical composition (optical emission spectrometry)
• Mechanical properties (tensile, yield, hardness on sample basis)
• Dimensional accuracy (pi tape, micrometers; typical tolerance ±1% on diameter)
• Straightness and surface condition (visual + ultrasonic where required)
• Internal soundness (ultrasonic testing on larger sizes)
● Internal standards exceed ASTM B139 requirements. Typical C51000 properties: Tensile strength ≥500 MPa, Excellent fatigue resistance, Superior performance in corrosive and wear environments.
● ISO 9001:2015 certified operations ensure every large phosphor bronze round bar meets rigorous quality expectations for your critical projects.