The core differences lie in mechanical properties, corrosion resistance, and application scenarios:

• 17-4PH: Precipitation hardening stainless steel, tensile strength ≥1000MPa (twice that of 304 after heat treatment), moderate corrosion resistance, suitable for high-strength requirements (aerospace, medical devices, high-end equipment).
• 304 Stainless Steel: Austenitic stainless steel, tensile strength ~515MPa, better corrosion resistance in general environments, cannot be strengthened by heat treatment, suitable for low-strength, high-corrosion-resistance general scenarios.

Selection suggestion: Prioritize 17-4PH if tensile strength >800MPa is required; otherwise, choose 304/316 based on corrosion environment.

The four conditions balance strength, toughness, and corrosion resistance for different scenarios:

Note: We provide free heat treatment recommendations based on your part's usage and load conditions.

With imported 5-axis CNC machining centers and CMM inspection, we can achieve:

• Small to medium parts (≤100mm): Minimum tolerance ±0.005mm (IT5 grade accuracy);
• Medium to large parts (100-500mm): Tolerance ±0.01-±0.02mm (IT6-IT7 grade);
• Complex structural parts (multi-surface, deep holes): Tolerance ±0.015-±0.03mm.

Core factors affecting tolerance:

1. Part size: Larger size increases thermal deformation and clamping error impact, making tolerance harder to control;
2. Structural complexity: Deep holes, thin walls, and multi-step structures increase machining difficulty;
3. Heat treatment: Parts may have slight deformation after heat treatment, requiring additional allowance for secondary finishing;
4. Surface treatment: Post-processes like passivation and polishing may affect dimensional accuracy (needs prior communication).

• Minimum Order Quantity: 1 piece (supports sample prototyping, small-batch trial production, and seamless transition to mass production);
• Sample Lead Time: 3-7 working days (3 days for regular parts, 5-7 days for complex structures/special heat treatment), express service available (fastest 24 hours, subject to additional communication);
• Mass Production Lead Time:
  • Small batch (1-100 pieces): 5-10 working days;
  • Medium batch (100-500 pieces): 10-15 working days;
  • Large batch (over 500 pieces): 15-25 working days (adjustable based on order).

Note: The lead time includes machining, heat treatment, quality inspection, and packaging, excluding logistics time (SF/Deyun by default, express available).

Quality Assurance System:

1. Incoming inspection: Each batch of 17-4PH material comes with a factory quality certificate (ASTM A564 standard) to inspect composition and hardness;
2. In-process inspection: First-piece inspection and batch patrol inspection for each process (100% inspection for key dimensions);
3. Final inspection: CMM (dimensional), hardness tester (hardness), salt spray tester (corrosion resistance), tensile tester (mechanical properties);
4. Certifications: ISO9001/IATF16949 system certification, supporting third-party authoritative inspection (e.g., SGS).

Quality Issue Handling Process:

• Feedback time limit: Raise quality objections within 7 days of receipt (with inspection report/physical photos/videos);
• Verification and handling: Response within 24 hours, verification of responsibility within 3 working days (for quality issues not caused by improper customer use);
• Solutions: Free rework/reproduction (per original lead time or express) or full refund, with logistics costs borne by us;
• Long-term guarantee: 1-year quality warranty (under normal use conditions) and lifetime technical support.