ASTM B164 Alloy 400 Round Bar N04400 Corrosion Resistant Hot or Cold Worked for Shafts and Valve Parts

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM B164 Alloy 400 round bar for shafts and valve parts (N04400) specifically for buyers requiring machined marine, pump, and valve components. This product is available as hot- or cold-worked round bar to ASTM B164 standards for shafts, valve trim, fasteners, and pump components.

Alloy 400 is a nickel-copper solid-solution alloy offering useful strength and resistance in flowing seawater, caustic alkalis, and selected reducing media. While K500 offers precipitation-hardened strength, Alloy 400 remains preferable where moderate strength, fabricability, and established corrosion performance are sufficient.

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

• 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.

• 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

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.