On October 16, 2025, we received an inquiry from a UK distributor of forged pipe fittings. JN Company delivered quickly within 21 days, and the customer was very satisfied with our ASTM B564 UNS N04400 Forged Rings in Proof Machined Condition and our service. Heat treatment and hardness shall meet the requirements of NACE Specifications.
ASTM B564 UNS N04400 Forged Rings, our company will ensure that all materials are accompanied by an inspector-certified EN 10204 Type 3.1 certificate, explicitly stating full chemical composition, mechanical properties, and confirmation of compliance with both NACE MR0175/ISO 15156 and NACE MR0103.
The rings in the proof machined state undergo rigorous forging, rough machining, and 100% final dimensional inspection using calibrated instruments to ensure strict dimensional tolerance control within +2.0/-0.0 mm for outer diameter and wall thickness and +0.0/-2.0 mm for inner diameter.
For raised face flanges, specialized spiral sawtooth finishing tools are used to maintain a surface finish within the range of 125-250 μin AARH (3.2-6.3 μm Ra), and each workpiece is measured and verified using a surface roughness comparator and profilometer.
UNS N04400 is a nickel-copper alloy rather than a super duplex stainless steel, and therefore does not meet the PREN >40 and forced solution annealing conditions specified by SDSS products, we will still perform solution annealing at 870-980℃ according to standard procedures, followed by rapid water quenching, to ensure optimal corrosion resistance and microstructure stability.
24 PCS UNS N04400 Forged Ring to England
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Sl. No |
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PACKAGE - 1 |
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1 |
OD 250 mm x ID 152mm x 40 mm Thickness |
ASTM B564 UNS N04400 |
4 |
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2 |
OD 422 mm x ID 303mm x 40 mm Thickness |
ASTM B564 UNS N04400 |
8 |
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3 |
OD 485 mm x ID 334mm x 40 mm Thickness |
ASTM B564 UNS N04400 |
2 |
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4 |
OD 540 mm x ID 385mm x 40 mm Thickness |
ASTM B564 UNS N04400 |
6 |
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5 |
OD 774 mm x ID 588mm x 40 mm Thickness |
ASTM B564 UNS N04400 |
4 |
Material Certification as per EN 10204.3.1 + NACE MR 0175 + NACE MR 0103
Forged Rings are in Proof Machined Condition.
Tolerance for Forged Rings: OD & Thickness: +2.0mm / -0.0mm & ID: +0.0mm / -2.0mm
Flange RF Finish 125-250 AARH
SDSS Materials shall have a PREN > 40.
SDSS Items Shall Be in the Solution Annealed Condition.
Heat Treatment and Hardness Shall meet the requirements of NACE Specifications.
Why Choose JN ASTM B564 UNS N04400 Forged Ring?
Customers choosing our ASTM B564 UNS N04400 forged rings receive an EN 10204 Type 3.1 certificate issued by a third-party inspection agency. The certificate clearly indicates the chemical composition and mechanical properties, conforming to NACE MR0175/ISO 15156 and NACE MR0103 requirements, and includes actual hardness values (<=35 HRC) and complete heat treatment records, ensuring absolute safety and traceability of the material in H₂S-containing acidic environments.
We have a complete Monel 400 production chain. All forged rings are delivered in Proof Machined condition, with strict dimensional tolerances of +2.0/-0.0 mm for outer diameter/wall thickness and +0.0/-2.0 mm for inner diameter.
Each piece undergoes 100% ultrasonic testing and coordinate measuring machine (CMM) measurement to guarantee that geometric accuracy and internal quality fully meet customer drawings and specifications.
For flange sealing surface machining, we employ specialized 90℃ spiral sawtooth cutters and constant feed parameters to ensure the raised face surface roughness remains consistently between 125-250 μin AARH.
Each finished product undergoes dual verification using certified roughness comparison blocks and an electronic roughness tester to avoid leakage risks caused by excessively smooth or rough sealing surfaces.
For 20 consecutive years, we have been a stable supplier of UNS N04400 forged rings to oil and gas projects in the Middle East, North Sea, and North America. We possess PED 2014/68/EU, AD2000-W0, API 20C certifications, and long-term approvals from numerous customers, offering delivery times as fast as 3-8 weeks and a 10-year quality guarantee for bulk orders.
