Custom Heavy-Duty Welded Structural Carbon Steel Frame

Q: What machined parts and fabrication services does Shengtao provide?

Shengtao is a China-based, ISO 9001-certified one-stop manufacturer delivering precision-machined and fabricated metal parts across 10 product categories:

• CNC Precision Machined Parts — turned, milled, and 5-axis complex components

• Stamped & Formed Metal Parts — progressive die stamping, deep drawing, sheet metal fabrication

• Welded & Fabricated Steel Assemblies — structural weldments, pressure vessel shells, pipe spools

• Hydraulic & Pneumatic Components — honed cylinder barrels, chrome-plated piston rods, valve bodies

• Automotive Precision Parts — drivetrain, suspension, steering, and engine components

• Surface-Treated Steel Parts — mirror polishing, electropolishing, hard chrome, zinc/nickel plating

• Precision Tube & Pipe Machined Parts — tube end machining, honing, pipe spool assemblies

• Laser Cut & Waterjet Cut Parts — precision 2D profiles up to 150 mm thick

• Machined Pipe & Tube Fittings — threaded fittings, forged flanges, custom connectors

• Special Alloy & High-Performance Parts — Inconel, Hastelloy, Titanium, tool steel components

We work from your drawings, providing customized parts — we do not sell standardized off-the-shelf items. Send your RFQ with a drawing to start a quotation.

Q: Can you manufacture custom parts from my engineering drawings? What file formats do you accept?

A: Yes — custom manufacturing to your drawings is our core business. We accept:

• 2D drawings: PDF, DWG, DXF

• 3D models: STEP (.stp), IGES (.igs), SolidWorks (.SLDPRT / .SLDASM), CATIA, Inventor

The process is straightforward:

1. Send your drawing/model with material specification, quantity, and any special requirements.

2. We sign an NDA before reviewing your files.

3. Our engineering team performs a DFM (Design for Manufacturability) review and flags any concerns.

4. We send a formal quotation with price, lead time, and technical notes within 24–48 hours.

We handle everything from raw material sourcing through machining, heat treatment, surface finishing, inspection, and export packaging — delivering parts ready for your assembly line.

Q: What materials can you source and machine for my parts?

A: We source and machine a comprehensive range of metals, all with certified mill test reports (MTR):

Stainless steel: 303, 304, 316, 316L, 321, 410, 420, 430, 2205, 2507 (duplex/super duplex)

Carbon steel: A36, 1020, 1045, A105, A106 Gr.B, API 5L X42–X80, S235, S355

Alloy steel: 4140, 4340, 8620, 42CrMo4, 34CrNiMo6, 20CrMnTi, A387 Gr.11/22

Aluminum: 6061-T6, 7075-T6, 5052, 5083

Tool steel: D2, H13, M2, P20, S7

Nickel alloys: Inconel 600/601/625/718, Hastelloy C-276/C-22, Monel 400

Titanium: Grade 1, Grade 2, Grade 5 (Ti-6Al-4V), Grade 23 (Ti-6Al-4V ELI)

Brass & copper: C36000, C11000, C26000

If your specification calls for a material not listed above, please ask — we work with approved steel mills and can source commercial grades, pressure-vessel grades, and AMS/aerospace grades.

Q: Do you offer welding and fabrication for complex assemblies, including code-compliant work?

A: Yes. Welding and fabrication is a core Shengtao capability, covering single-part weldments through to fully welded structural frames, pressure vessel shells, and pipe spools.

Welding processes: SMAW, GMAW/MIG, GTAW/TIG, SAW (submerged arc), FCAW, orbital TIG

Welder qualifications: AWS D1.1 / D1.6, ASME Section IX, EN ISO 9606

NDE capabilities: 100% VT, PT, MT, UT, RT (X-ray) available, including third-party witness

We fabricate to:

• ASME Section VIII Div.1 — pressure vessels

• ASME B31.1 / B31.3 / B31.4 — power, process, and liquid piping

• AWS D1.1 — structural steel

• PED 2014/68/EU — European pressure equipment

• NACE MR0175 / ISO 15156 — sour service

Every fabrication ships with a full data book: weld map, WPS/PQR, welder qualifications, NDE reports, MTRs, dimensional inspection, and hydrostatic test certificate.

Q: Do you offer engineering support or design feedback on my part drawings?

A: Yes, and we encourage it. Our in-house engineering team reviews every drawing before production and provides DFM (Design for Manufacturability) feedback at no cost:

We check for:

• Machinability: features that are difficult or impossible to produce (e.g., sharp internal corners, unreachable undercuts, extreme aspect ratios)

• Tolerance optimization: identifying dimensions where looser tolerances can reduce cost without affecting function

• Material alternatives: suggesting equivalent grades if the specified material has long lead times or is cost-prohibitive

• Cost reduction opportunities: changes that simplify fixturing, reduce setups, or allow more efficient tooling

This is a value-added service at no extra charge — many customers have reduced per-part cost by 15–30% through DFM suggestions while maintaining full functionality.

We never modify your drawing without your written approval. All DFM suggestions are clearly annotated on a marked-up drawing for your review.