ASTM B164 Alloy 400 Round Bar for Shafts and Valve Parts | N04400

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm b164 alloy 400 round bar for shafts and valve parts | n04400 for buyers whose primary search intent is machined marine, pump and valve components, not generic stainless or nickel-alloy stock. The page should be quoted against the selected standard edition, the equipment or component drawing and the governing design code. Hot- or cold-worked Alloy 400 round bar to ASTM B164 for shafts, valve trim, fasteners and pump components.

The material decision should start with service conditions. Nickel-copper solid-solution alloy with useful strength and resistance in flowing seawater, caustic alkalis and selected reducing media. K500 offers precipitation-hardened strength; Alloy 400 remains preferable where moderate strength, fabricability and established corrosion performance are sufficient. This comparison belongs in the enquiry stage because a higher alloy name does not automatically deliver the lowest life-cycle risk.

A complete RFQ needs product form, grade/UNS, ordered condition, dimensional basis, tolerances, quantity and inspection level. State diameter, tolerance, length, straightness, surface, machining allowance and final-part criticality. For pressure-containing products, the material standard controls product quality; it does not replace pressure-design calculations, corrosion allowance or code approval.

Manufacturing and documentation must remain connected. Hot working or cold drawing, heat treatment where ordered, straightening and surface finishing. Preserve heat identity after cutting. The baseline verification plan is: MTC, chemistry/mechanical tests, PMI, dimensional/straightness checks and optional UT/PT. Any supplementary requirement—PMI extent, UT class, eddy-current acceptance, corrosion testing, grain size, roughness, cleanliness or third-party inspection—must appear in the PO before production.

Fabrication guidance: Use sharp tools and adequate feeds to avoid work hardening. Confirm thread form, cold-heading route and final stress condition. Selection boundary: Do not specify solely by ‘marine grade.’ Stagnant seawater, crevices, biofouling and galvanic coupling can defeat otherwise good bulk corrosion performance. Buyers should provide fluid composition, maximum and minimum temperature, pressure, design life, fabrication route and applicable code so the quotation can separate mandatory requirements from optional controls.

Standards, Dimensions and Supply Definition

Material and Selection Markers

Use note: Values above are concise identification/selection markers, not a replacement for the ordered ASTM/AWS chemistry table or the MTC.

Candidate Applications

• Propeller and pump shafts.
• Valve stems.
• Fasteners.
• Chemical-processing mixer components.

Buyer Decision Boundary

K500 offers precipitation-hardened strength; Alloy 400 remains preferable where moderate strength, fabricability and established corrosion performance are sufficient.

Processing, Inspection and Documentation

• Manufacturing: Hot working or cold drawing, heat treatment where ordered, straightening and surface finishing. Preserve heat identity after cutting.
• Fabrication: Use sharp tools and adequate feeds to avoid work hardening. Confirm thread form, cold-heading route and final stress condition.
• Inspection: MTC, chemistry/mechanical tests, PMI, dimensional/straightness checks and optional UT/PT.
• Traceability: Keep heat/lot identity through cutting, machining, bending, welding, testing and packing.
• Documentation: Confirm MTC type, test reports, packing list, country-of-origin statement and third-party inspection before production.

RFQ Checklist

• Standard and adopted edition: ASTM B164
• Grade / UNS: Alloy 400 / N04400
• Form and route: Rod and round bar
• Dimensions, tolerances, quantity and unit basis
• Delivery/heat-treatment condition and surface/end finish
• Design code, service fluid/atmosphere, pressure and temperature
• Inspection/NDE, acceptance criteria, MTC and third-party witness points
• Marking, preservation, packing and delivery destination

Inquiry CTA

Frequently Asked Questions

1. What does ASTM B164 cover for this product? Hot- or cold-worked Alloy 400 round bar to ASTM B164 for shafts, valve trim, fasteners and pump components. Always purchase to the edition adopted by the contract or project specification.
2. Is this product seamless, welded, forged, rolled or drawn? The PO must state the required route exactly: Rod and round bar. Do not rely on a product photograph or a family name to establish the route.
3. How should buyers select Alloy 400? Nickel-copper solid-solution alloy with useful strength and resistance in flowing seawater, caustic alkalis and selected reducing media. K500 offers precipitation-hardened strength; Alloy 400 remains preferable where moderate strength, fabricability and established corrosion performance are sufficient.
4. Which dimensions must be included in the RFQ? State diameter, tolerance, length, straightness, surface, machining allowance and final-part criticality. Add quantity, unit basis, tolerances and any drawing-controlled geometry.
5. What heat-treatment or delivery condition is required? Hot-worked/annealed or cold-worked condition as ordered; mechanical properties must be tied to diameter and condition. The MTC and heat-treatment records should use the same grade and condition language as the PO.
6. Which inspection documents can be requested? MTC, chemistry/mechanical tests, PMI, dimensional/straightness checks and optional UT/PT. The final inspection scope must be agreed before order placement.
7. Is it suitable for the intended corrosive or high-temperature service? Do not specify solely by ‘marine grade.’ Stagnant seawater, crevices, biofouling and galvanic coupling can defeat otherwise good bulk corrosion performance. A material engineer should approve the final choice using actual service data.
8. What fabrication issues should be addressed? Use sharp tools and adequate feeds to avoid work hardening. Confirm thread form, cold-heading route and final stress condition. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.
9. What are typical applications? Common candidate applications include propeller and pump shafts, valve stems, fasteners, chemical-processing mixer components. These examples are not blanket design approvals.
10. What information is needed for a firm quotation? Send standard and edition, grade/UNS, form, dimensions, condition, quantity, delivery destination, inspection/NDE, documentation, packing and any third-party inspection or code requirement.