China Die Forging Manufacturer | Forged Ball Valve Bodies

About Us

Mon, 01 Jan 0001 00:00:00 +0000

Who We Are

Zhejiang Longrui Forging Co., Ltd. is a specialist closed-die (drop) forging manufacturer based in Yunhe County, Lishui, Zhejiang, China. The plant covers close to 40,000 m² with around 70 employees, and runs forging, heat treatment, machining and testing under one roof.

Located at No. 108 Qihang Street, Bailongshan Subdistrict, Yunhe County, Lishui, Zhejiang, our site has a building area of close to 15,000 m², with forging, heat treatment, machining and testing in one continuous line from billet to finished part.

API Spec 20C, API Q1 & NORSOK M-650

Mon, 01 Jan 0001 00:00:00 +0000

API Spec 20Cclosed die forgings

API Spec Q1quality system audit

NORSOK M-650special materials

AD2000-W0+ PED 2014/68/EU

In short. Longrui Forging holds API Monogram licence 20C-0051 for closed-die forgings, covering forging groups 1 to 4 at FSL 1 and FSL 2, with the quality management system audited to API Spec Q1:2023. The scope covers carbon and low-alloy, martensitic, austenitic and PH stainless, corrosion-resistant and duplex stainless steels, and design is the one exclusion recorded in our quality manual.NORSOK M-650 qualification and PED 2014/68/EU with AD2000-W0 by TÜV NORD are held at the same site, so a forging can be supplied against all four schemes, provided the grade, test schedule and acceptance criteria required for that part fall within the approved scope of each. Whether a specific part is covered is confirmed by the certificate documents issued with the order.

Capability

Mon, 01 Jan 0001 00:00:00 +0000

In short. Zhejiang Longrui Forging runs three multi-directional forging presses of 6,000 T, 3,000 T and 2,000 T in Yunhe, Zhejiang, China, and forges closed-die parts from 5 kg to 520 kg. Machining covers Ø600 × 1,000 mm and the plant has an annual die-forging capacity of 15,000 tonnes. The works is licensed to API Spec 20C (Monogram 20C-0051) and holds NORSOK M-650, PED 2014/68/EU with AD2000-W0, and ISO 9001/14001/45001.

Certifications

Mon, 01 Jan 0001 00:00:00 +0000

In short. Longrui Forging is certified to API Spec 20C (Monogram licence 20C-0051) and audited to API Spec Q1, and holds NORSOK M-650 material manufacturer qualification, PED 2014/68/EU and AD2000-W0 approval by TÜV NORD, BV Mode II NR320 (G0247) and ISO 9001:2015, ISO 14001 and ISO 45001. Chemical composition is verified heat by heat on an in-house spark spectrometer, and heat treatment, mechanical testing and NDT are recorded against the heat number. Every shipment leaves with a material test certificate and traceability from steel heat to finished part.

Closed Die Forging

Mon, 01 Jan 0001 00:00:00 +0000

6,000 Tmulti-directional presses

5–520 kgpart weight range

15,000 tannual capacity

5 patentson our own die designs

Longrui Forging is a closed die forging manufacturer in China. We form heated steel between shaped dies on multi-directional hydraulic presses of 6,000 T, 3,000 T and 2,000 T, producing parts from 5 kg to 520 kg. We design and make our own dies, and we heat treat, test and machine the parts in the same plant.

What Closed Die Forging Is

Multi-directional die forging is designed to be flashless: in principle it removes the large lateral flash of open die forging. In production, blank weight tolerances and the difficulty of controlling metal flow in complex parts still leave small longitudinal fins, and under some conditions local flash that has to be controlled.

Contact Us

Mon, 01 Jan 0001 00:00:00 +0000

Talk to Our Export Team

Send your drawing, material grade, quantity and target date to sales@longruiforging.com or WhatsApp +86 188 1511 5555. Our export team checks die-forging feasibility and replies with a quotation, usually within 24–48 hours, including NDT and heat-treatment options.

We forge ball valve bodies & covers (1/2″–12″, Class 150–2500), gears, flanges and custom forgings in carbon steel, alloy steel, stainless steel and nickel alloys.

To help us quote accurately and quickly, please include in your inquiry:

Downloads

Mon, 01 Jan 0001 00:00:00 +0000

Three documents, straight PDFs, no forms. Between them they cover what most enquiries ask first: what we can forge, what we forge it from, and what to send us for a quotation.

PDF · 1 page · Language: EN · Updated: 2026-10-18

Capability Linecard

Presses and weight ranges, products, materials, certifications and contact details, on one page. Keep it on file as a supplier sheet, or pass it to a colleague.

Duplex & Super Duplex Forgings

Mon, 01 Jan 0001 00:00:00 +0000

F51 · F53 · F55duplex grades we forge

PREN ≥ 40super duplex grades

5–520 kgsingle-piece weight

NORSOK M-650material manufacturer

A duplex stainless steel is a two-phase material: about half ferrite, half austenite. The result is a grade family with roughly twice the yield strength of 316L, and far greater resistance to chloride stress corrosion cracking, which is what puts duplex on seawater, subsea, desalination and chemical duty.

Longrui Forging forges duplex valve bodies, covers, flanges, hubs and general parts in F51, F53 and F55, between 5 kg and 520 kg per piece, on the 6,000 T multi-directional press. Forging, solution treatment and testing sit under one roof, under our NORSOK M-650 material manufacturer qualification.

Duplex, Stainless & Special Steel Forgings

Mon, 01 Jan 0001 00:00:00 +0000

F51 / F53 / F55duplex & super duplex

PREN ≥ 40super duplex grades

520 kglargest single forging

625 / 718 / 825nickel alloys

Longrui Forging is a closed die forging manufacturer in China, making parts in nickel alloys 625, 718 and 825, duplex and super duplex stainless steel in grades F51, F53 and F55, plus other stainless, alloy, carbon and structural steels, from 5 kg to 520 kg per piece. Heat treatment, testing and machining are all in house, under our NORSOK M-650 material manufacturer qualification.

Forged Ball Valve Covers & Bonnets

Mon, 01 Jan 0001 00:00:00 +0000

1/2″–12″cover sizes

Class 150–2500pressure classes

520 kglargest single forging

6,000 Tmulti-directional press

A ball valve cover closes the top opening of the valve body and carries the stem, the seat retainer or the trunnion. It is part of the pressure boundary, so the joint between cover and body is one of the places a ball valve is most likely to leak.

On three-piece ball valves the two outer sections are called end covers, or left and right bodies. They close the ends of the valve rather than the top, and they carry no stem bore. We forge them alongside the top covers.

Forged Gear Blanks

Mon, 01 Jan 0001 00:00:00 +0000

1045–42CrMousual gear grades

Ø600 × 1000 mmlargest blank we machine

520 kgheaviest single forging

15,000 tannual capacity

A gear blank is the forged body a gear is later cut from. The teeth are cut, not forged. What gear forging decides is everything under them: the grain flow, the density, and whether the finished tooth root has a fibre direction running with the load or across it.

Longrui Forging forges gear blanks, rings and gear shafts by closed-die forging, from 1045, 35CrMo, 42CrMo and 40Cr up to 520 kg per piece, supplied as-forged, rough machined, or with the teeth cut and ground to your drawing.

Forging Quality Control

Mon, 01 Jan 0001 00:00:00 +0000

Per heatspectrometer chemistry

Recordedheat treatment cycles

Per partultrasonic testing

XRFidentity before dispatch

Quality control on a forged part is a set of checks at fixed points in the process, each one leaving a record: chemistry per heat, heat treatment cycles per load, ultrasonic testing per part, and dimensional checks on the surfaces that get machined. On a forging order the checks and the records are agreed up front in the inspection and test plan. Longrui Forging runs them in its own plant in Yunhe County, Zhejiang, China, under ISO 9001 and our API Spec 20C licence.

Forging vs Casting

Mon, 01 Jan 0001 00:00:00 +0000

Grain flowfollows the forged shape

Porositywhat casting can leave

A105 ↔ WCBforged and cast carbon steel

520 kglargest part we forge

Forging vs casting comes down to what happens after the steel is melted: a casting is poured into a mould and solidifies into shape, while a forging is worked between dies, which closes internal porosity and turns the grain flow along the part instead of leaving it as-cast. Forged or cast is the first question behind a lot of drawings: it decides the material specification, the wall thickness, the inspection plan and the price.

Grade 91 Forgings (ASTM A182 F91)

Mon, 01 Jan 0001 00:00:00 +0000

UNS K90901ASTM A182 F91

9Cr-1Mo-Vmodified 9Cr-1Mo

415 / 620 MPamin. yield / tensile

~620 °Csteam service

Grade 91, written as ASTM A182 F91 in the forging specification, is a 9 % chromium steel with molybdenum plus small, tightly controlled additions of vanadium, niobium and nitrogen. That makes it a modified 9Cr-1Mo-V steel, UNS K90901, with the highest allowable stresses of the chrome-moly family. Longrui Forging forges F91 into valve bodies, covers, flanges, ring parts and fitting blanks from 5 kg to 520 kg per piece, in Yunhe County, Zhejiang, China.

Incoloy 825 Forgings (Alloy 825)

Mon, 01 Jan 0001 00:00:00 +0000

UNS N08825Alloy 825

Ni 38–46%nickel-iron-chromium

85 / 35 ksimin. tensile / yield

ASTM B564forging standard

Incoloy 825 is a nickel-iron-chromium alloy with molybdenum, copper and titanium additions, chosen for acids and seawater rather than for strength at temperature. The same grade is written as Alloy 825, or by its UNS number N08825; its European designation is 2.4858. Longrui Forging forges 825 into valve bodies, covers and process parts at its plant in Yunhe County, Zhejiang, China, where single pieces run from 5 kg to 520 kg.

Inconel 625 Forgings (Alloy 625)

Mon, 01 Jan 0001 00:00:00 +0000

UNS N06625alloy 625

Ni ≥ 58%nickel base

ASTM B564forging standard

NACE MR0175listed for sour service

Alloy 625 is the nickel alloy that comes up when a part has to survive seawater, sour gas or a chemical process without being replaced every few years. Buyers know it as Inconel 625 as well as Alloy 625, and by its UNS number N06625. It is a nickel-chromium-molybdenum alloy, strengthened by solid solution rather than by heat treatment, and it holds usable strength from sub-zero temperatures up to around 980 °C.

Inconel 718 Forgings (Alloy 718)

Mon, 01 Jan 0001 00:00:00 +0000

UNS N07718alloy 718

Ni 50–55%nickel base

ASTM B564forging standard

827–1000 N/mm²proof after ageing

Alloy 718 is the nickel alloy that holds high strength at temperature. It gets that strength from a heat treatment rather than from the press alone: a solution treatment followed by a controlled ageing cycle precipitates fine particles through the metal, and those particles block the movement that would otherwise let the part deform. In the aged condition it reaches roughly 830 to 1000 N/mm² proof stress and 32 to 40 HRC, with corrosion resistance that stands up in seawater.

Manufacturing Process

Mon, 01 Jan 0001 00:00:00 +0000

Closed-die forging of ball valve bodies and other safety-critical components leaves no room for shortcuts. That is why every Longrui forging moves through the same tightly controlled chain of production and quality-control stages, from the moment raw steel arrives at our yard to the day finished parts are loaded for shipment.

Each stage below is performed by dedicated operators, recorded on batch cards and fully traceable to the material certificate. If you are qualifying a new forging supplier, this is exactly how your parts will be made. The presses and size limits behind these stages are on the Capability page; the standards behind the certificates are on API 20C & NORSOK M-650.

Material Test Certificates

Mon, 01 Jan 0001 00:00:00 +0000

2.1 / 2.2 / 3.1 / 3.2EN 10204 document types

3.1 standard3.2 on request

8 fieldsto check on a certificate

XRFidentity check before packing

A material test certificate (MTC) is the document that tells you what the steel in your part actually is: which heat it came from, its chemical composition, its mechanical test results, and the condition it was heat treated to. European and international projects call it an MTC. North American projects usually say mill test certificate, mill test report (MTR) or material test certificate. It is the same document under three names.

Products

Mon, 01 Jan 0001 00:00:00 +0000

Forged Ball Valve Bodies & Covers

Our core product line: closed-die forged bodies and covers (bonnets) for two-piece and three-piece ball valves, floating and trunnion type.

Size range: 1/2″ – 12″
Pressure classes: Class 150 / 300 / 600 / 1500 / 2500
Types: floating, trunnion-mounted, twin-ball floating
Materials: carbon steel, low-temp steel, stainless & duplex, alloy and nickel alloys

Size and material detail for this line is on the forged valve bodies page. Covers and bonnets have their own page at forged valve covers.

Valve Body Forgings for Ball Valves

Mon, 01 Jan 0001 00:00:00 +0000

6,000 Tmulti-directional presses

520 kglargest single forging

Ø600 × 1000 mmmachining envelope

15,000 tannual capacity

Longrui Forging is a die forging factory in China. We make ball valve bodies and covers from 1/2″ to 12″, Class 150–2500, in carbon, alloy, stainless, duplex and nickel alloys. Hot forging, heat treatment, NDT and machining all happen in our own plant, and we are certified to API Spec 20C, NORSOK M650 and EU PED / AD2000-W0. Covers and bonnets are covered in detail on the forged valve covers page.