説明
簡単な回答
インコネル 625 stud bolts use UNS N06625, a nickel-chromium-molybdenum-niobium alloy valued for broad corrosion resistance and useful strength without a mandatory age-hardening treatment. ASTM B446 defines multiple heat-treated or cold-worked grades, so the required condition must be stated rather than ordering “625” alone.
Product specifications
| 材質の指定 | Nickel-chromium-molybdenum-niobium Alloy 625; UNS N06625; W.Nr. 2.4856 |
|---|---|
| 材料 / bar reference | ASTM B446 ロッドとバー, with Grade 1, 2 または 3 condition selected for the intended service |
| Finished fastener reference | ASTM F468 for general nonferrous studs or ASTM F2281 for heat-resistant service when alloy, 状態, size and requirements are applicable |
| Stud configuration | Fully threaded stud bolts; custom double-end details by approved drawing |
| Inch threads | UNC, UNF and 8UN to ASME B1.1 as specified |
| Metric threads | Coarse or fine metric threads to ASME B1.13M / ISO requirements as specified |
| 寸法 | Diameter and length to flange bolting schedule, ASME B18.31.2 reference or approved drawing |
| マッチするナット | Compatible heavy hex or project-design nuts supplied after material and property review |
| ドキュメント | EN 10204 3.1 MTC, heat traceability and dimensional report; PMI/NDT/testing optional |
Why specify Inconel 625 スタッドボルト?
合金 625 海水用と考えられています, 塩化, chemical processing and selected elevated-temperature duties. It offers a different strength and heat-treatment strategy from precipitation-hardened Alloy 718. The correct B446 grade, finished-fastener requirement and design allowables must be aligned.
Corrosion resistance and material limits
High nickel, chromium and molybdenum contents support resistance to many oxidizing and reducing environments and to localized attack in seawater. No alloy is immune to every acid concentration or contaminated process stream; review actual chemistry, エアレーション, temperature and crevice conditions.
エンジニアリングノート: Material selection must be based on the complete process environment and governing design code. Product-page information is not a design allowable or a guarantee of service life.
Temperature and mechanical-property control
ASTM B446 distinguishes Grade 1, 学年 2 and cold-worked Grade 3 conditions with different intended service ranges and property objectives. Do not select a heat-treatment condition from a generic temperature claim; use the project code, stress analysis and ordered material specification.
代表的な用途
- Offshore and subsea flange bolting
- 海水, brine and desalination equipment
- Chemical and pollution-control systems
- Power-generation and exhaust connections
- 海兵隊, aerospace and cryogenic equipment
基準, threads and flange fit-up
The material specification controls alloy chemistry, 製品形態, heat treatment and mechanical tests. The finished-fastener specification controls stud manufacture and acceptance. The flange standard or bolting schedule controls diameter, thread and length. These documents perform different jobs and should all be identified at order review.
Cut threads and rolled threads can produce different dimensional, surface and residual-stress characteristics. State the required manufacturing method when it is a design requirement. Thread fit, end chamfers, nut engagement and exposed thread allowance must match the assembly procedure.
マッチするナット, lubrication and galling control
High-alloy studs should be purchased as part of an engineered bolting system. Nut material and proof strength must support the specified stud properties without creating an unacceptable corrosion couple. Clean threads, controlled surface finish and an approved lubricant reduce galling and torque scatter.
Torque values are not universal. Friction coefficient, coating or lubricant, nut condition, tightening sequence and reuse policy all affect achieved preload. Use a project-approved torque-tension or hydraulic-tensioning procedure.
製造業, 検査と文書化
Production can include material verification, sawing, 準備を終える, thread machining or rolling, クリーニング, dimensional inspection and permanent identification. Heat numbers remain traceable through manufacturing. Additional controls can include PMI, 硬度, tensile tests, impact tests, microstructure examination, corrosion testing, ultrasonic testing or dye penetrant testing when specified.
Inspection documents should identify the ordered UNS grade, material specification and condition—not only a trade name. 第三者による検査, EN 10204 3.2 certification and customer hold points can be incorporated before production when agreed.
What to include in your RFQ
特定 ASTM B446 grade/condition, F468 or F2281 requirements where applicable, 機械的特性, 設計温度, 糸, nut alloy, 追試, PMI, heat treatment records and EN 10204 認証.
- Exact UNS designation and governing material specification/edition
- Finished-fastener and dimensional standard
- 直径, スレッドシリーズ, pitch and overall length
- Required material condition and mechanical properties
- Nut and washer material, dimensions and quantity
- 設計温度, process environment and special service standard
- テスト, 検査, traceability and certificate type
- Lubrication, コーティング, マーキング, packing and delivery requirements
Authoritative material reference
Review Special Metals INCONEL alloy 625 technical bulletin together with the contractually required ASTM/ASME/ISO editions. Manufacturer literature supports material screening; the purchase order and governing code control supply.
Related stud bolt materials
よくある質問
Which ASTM B446 grade should be ordered?
The service and design basis determine whether Grade 1, 学年 2 or Grade 3 is appropriate. State the required condition and mechanical properties on the purchase order.
Is Alloy 625 the same as Alloy 718?
いいえ. 625 is primarily solid-solution strengthened, その間 718 is precipitation hardenable and normally chosen when substantially higher strength is required.
Can 625 stud bolts be used in seawater?
合金 625 is widely considered for seawater service, but the full joint design, 隙間, cathodic protection, temperature and process contaminants still require engineering review.
Are matching nuts and PMI available?
はい. Specify nut material and properties, PMIの程度, 証明書, lubrication and any lot-level or piece-level traceability requirements.
Trade names are used for material identification. INCONEL®, INCOLOY® and MONEL® are trademarks of Special Metals Corporation; HASTELLOY® is a trademark of Haynes International, Inc. SASA FLANGE supplies products to the specifications stated on the accepted order.
