説明
簡単な回答
インコロイ 800, 800H and 800HT stud bolts belong to one nickel-iron-chromium alloy family but are not interchangeable labels. UNS N08800, N08810 and N08811 have distinct chemistry and heat-treatment controls, particularly for creep and rupture performance. The exact UNS grade must appear on the RFQ, MTC and marking.
Product specifications
| 材質の指定 | 合金 800 UNS N08800; 800H UNS N08810; 800HT UNS N08811 |
|---|---|
| 材料 / bar reference | ASTM B408 nickel-iron-chromium alloy rod and bar in the exact ordered UNS grade and condition |
| Finished fastener reference | ASTM F2281 or project high-temperature fastener specification when alloy, 学年, size and condition are covered |
| 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 Incoloy 800 スタッドボルト?
合金 800 is used for oxidation and carburization resistance in moderately elevated-temperature equipment. 800H and 800HT use controlled carbon and grain-size/chemistry requirements for improved creep and rupture behavior. Selection must follow the equipment design code and required material condition.
Corrosion resistance and material limits
These alloys resist oxidation and many carburizing environments and also provide useful aqueous corrosion resistance. They are not universal acid-service alloys; sulfur activity, halides, molten salts, reducing conditions and thermal cycling can change the preferred material.
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
Do not publish or procure one generic maximum temperature for all three grades. 温度, ストレス, exposure time and atmosphere determine whether 800, 800H or 800HT is appropriate and which code allowables apply.
代表的な用途
- Furnace fixtures and radiant-tube connections
- Petrochemical reformers and process heaters
- Heat exchangers and steam-system components
- Power-generation and thermal-processing equipment
- Ethylene, hydrogen and industrial heating systems
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
Specify N08800, N08810 or N08811; ASTM B408 状態; grain-size and heat-treatment requirements; creep or elevated-temperature properties; F2281/project fastener rules; 糸, ナッツ, coating restrictions and certificates.
- 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 INCOLOY 800 and 800H/800HT technical bulletins 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
Are 800, 800H and 800HT interchangeable?
いいえ. They have different UNS designations and controls for carbon, chemistry, grain size and heat treatment. Use only the grade approved by the design specification.
Which grade is preferred for creep service?
800H or 800HT may be evaluated for creep and rupture duty, but the design temperature, ストレス, code and required properties determine the correct grade.
Can a certificate simply state “Alloy 800 family”?
No for controlled procurement. The MTC and product identification should state the exact UNS grade and applicable material specification.
Are matching high-temperature nuts available?
はい, after confirming compatible material, 強さ, 寸法規格, heat treatment and the joint’s torque or tensioning procedure.
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.
