Heavy Machined Forgings & Deep-Hole Components
Heavy machined forgings are large open-die forged steel components finished by precision machining: deep-hole bored cylinders and sleeves, tube sheets, flanges, rings, blocks and custom bodies up to 40 tonnes. Deep-hole machining capability covers bores from 40 mm to over 1000 mm at length-to-diameter ratios beyond 10:1, with UT/MT/PT inspection and full material certification.
| Max weight | Up to 40 t per piece |
|---|---|
| Deep-hole boring | Ø40 – 1000+ mm, L/D > 10:1 |
| Part types | Cylinders, sleeves, tube sheets, rings, flanges, custom bodies |
| Machining | Turning, boring, milling, drilling, grinding |
| Heat treatment | Normalize, Q&T, stress relief per spec |
| Inspection | UT, MT, PT, hardness, dimensional/CMM report, MTC 3.1 |
Materials
- · Carbon and alloy steels (C45, 42CrMo4, 34CrNiMo6)
- · Stainless and tool steels per drawing
RFQ Checklist
Include this in your inquiry for a fast, accurate quote
- 01Drawing or model with material, tolerances and finishes
- 02Heat-treatment condition and hardness/mechanical requirements
- 03NDT scope and acceptance class (e.g. EN 10228-3 class 3)
- 04Quantity, and whether test bars/witness inspection are required
- 05Delivery condition (rough/finish machined) and schedule
Built around the machine shop
Jiyuan’s special steel base pairs forging presses with heavy machining: deep-hole boring lines, large lathes and boring mills sized for mold bodies, mill housings and cylinder blanks. That co-location is why complex one-off forgings with long bores are quoted here competitively.
Witness inspection welcome
Third-party or customer witness of UT and final dimensional inspection can be arranged; test plans and hold points are agreed at order stage.
- What is an open-die forging?
- A forging shaped between flat or simple dies rather than a closed impression. It suits large, low-quantity parts: the press works the steel from all sides, closing internal voids and refining grain, after which the part is machined to final geometry.
- What is deep-hole machining and when is it needed?
- Boring or drilling holes whose depth far exceeds their diameter (L/D above about 10:1) with specialized BTA/gundrilling equipment. Needed for hydraulic cylinders, mold bodies, hollow shafts and any bore where straightness and surface finish over a long length matter.
- Which quality documents are provided?
- Chemical analysis, heat-treatment charts, mechanical test results from integral or separate test bars, UT/MT/PT reports to the agreed class, and dimensional reports — packaged as an EN 10204 3.1 certificate.