Tanım
Five-percent-chromium high-temperature bolting
ASTM A193 B5 High Temperature Stud Bolts
ASTM A193 Grade B5 fully threaded alloy-steel stud bolts supplied to the required dimensions, threads and finish, with compatible heavy hex nuts and traceable documentation.
Hızlı cevap
ASTM A193 Grade B5 is a heat-treated chromium-molybdenum alloy-steel bolting grade containing substantially more chromium than B7. It is used when a piping or equipment specification requires B5 for high-temperature or special-purpose flange bolting.
Product at a glance
Nedir? ASTM A193 B5 saplama cıvataları?
ASTM A193 B5 stud bolts are high-temperature alloy-steel fasteners made to a chromium-molybdenum grade commonly described as five-percent-chromium bolting. The increased chromium content differentiates B5 from the more common B7 grade and aligns it with specific high-temperature piping and equipment material systems.
B5 identifies the bolting material and heat-treatment requirements; it does not define the flange, torque, overall stud length or service limit. A complete order states the ASTM edition, çap, iplik serisi, uzunluk, compatible nut grade, yüzey durumu, testing and project inspection requirements.
ASTM A193 B5 stud bolt specifications
| Malzeme | Chromium-molybdenum alloy steel, commonly described as 5% CR |
|---|---|
| Isıl işlem | Heat treated to ASTM A193/A193M Grade B5 |
| Yapılandırma | Fully threaded flange stud; double-end configuration by drawing |
| Threads | ÇİL, 8UN or project-specified series and class to ASME B1.1 |
| Boyutlar | ASME B18.31.2, flange bolting schedule or approved drawing |
| Matching nuts | ASTM A194/A194M Seviye 3 when specified and compatible |
| Finish options | Plain, black or project-approved high-temperature coating |
| Dokümantasyon | MTC, ısıl işlem, mechanical tests, sertlik, PMI and dimensions as ordered |
Son boyutlar, ısıl işlem, class or grade properties, kaplama, testing and acceptance criteria follow the purchase order and contractually required standard edition.
Why specify this grade?
Specify B5 when the approved piping material class or equipment datasheet explicitly calls for this chromium-molybdenum bolting grade. It is especially relevant when the adjoining pressure components use compatible chromium-alloy material systems and high-temperature performance is required.
Critical engineering note
Do not substitute B7, B6 or B16 for B5 based on strength alone. Kimya, izin verilen stres, oxidation behaviour, nut compatibility, coating temperature and the governing code must be reviewed for the actual joint.
Damızlık, nut and finish options
Tipik uygulamalar
Kalite, muayene ve dokümantasyon
B5 orders can be controlled with PMI and heat-number traceability so the chromium-alloy grade remains identifiable through cutting, threading, heat treatment and final inspection.
- EN 10204 3.1 material test certificate when ordered
- Heat-number and batch traceability from raw material to finished stud
- Chemical composition and mechanical-property records
- Heat-treatment record and hardness test results
- Dimensional inspection and calibrated thread gauging
- PMI when specified for chromium or A-286 alloy identification
- Yüzey, coating or passivation inspection as applicable
- Third-party inspection, marking and export packing by agreement
Teklif için gerekli bilgiler
- ASTM standard, exact grade or class and required edition
- Stud diameter, overall length, thread series and thread class
- Matching nut specification, grade or class, style and quantity
- Design and operating temperatures plus any cyclic or upset conditions
- Plain, passivated, coated or plated finish and approved process
- MTC, PMI, sertlik, çekme, coating and third-party inspection requirements
- Applicable piping code, equipment specification and owner supplements
- Miktar, delivery destination, packing method and required schedule
Sık sorulan sorular
What material is ASTM A193 B5?
B5 is a heat-treated chromium-molybdenum alloy-steel bolting grade commonly described as containing approximately five percent chromium.
Which nuts are commonly used with B5 stud bolts?
ASTM A194 Seviye 3 heavy hex nuts are commonly specified. The project must confirm nut grade, boyutlar, finish and temperature compatibility.
Is B5 interchangeable with B7 or B16?
No automatic interchangeability should be assumed. The grades differ in chemistry and high-temperature characteristics, and substitution requires engineering and purchaser approval.
Can B5 stud bolts be PMI tested?
Evet. PMI can be specified to verify alloy identity, with the method, sampling frequency, acceptance criteria and reporting stated in the inspection plan.
Related stud bolt products
Reference standard
Material and class requirements are controlled by ASTM A193/A193M. Thread form and stud dimensions may reference ASME B1.1 Ve ASME B18.31.2. State the contractually required edition in the purchase order and review all supplementary project requirements.
Teknik teklif isteyin
Send the grade or class, bolting schedule, nut requirement, hizmet koşulları, inspection plan and delivery destination for technical review.
