설명
High-strength low-temperature AISI 4340-type bolting
ASTM A320 L43 Low Temperature Stud Bolts
ASTM A320 Grade L43 fully threaded alloy-steel stud bolts for demanding low-temperature pressure joints, supplied to the specified impact-test temperature, dimensions and inspection plan.
빠른 답변
ASTM A320 Grade L43 is a high-strength low-temperature bolting grade associated with AISI 4340 nickel-chromium-molybdenum alloy steel. It is selected when the design specification requires L43 properties and impact performance; the required test temperature must be stated or confirmed for the order.
Product at a glance
무엇입니까? ASTM A320 L43 스터드 볼트?
ASTM A320 L43 stud bolts use a high-hardenability nickel-chromium-molybdenum alloy-steel grade for low-temperature bolting. The current ASTM scope notes that achieving specified impact values at very low test temperatures may require tighter control of chemistry, including phosphorus and sulfur, than ordinary AISI 4340 supply.
L43 should therefore be purchased as certified ASTM A320 bolting rather than as generic 4340 threaded bar. 지름, 열처리, 기계적 성질, impact-test temperature, specimen orientation, matching nuts and final machining all require coordinated manufacturing review.
ASTM A320 L43 stud bolt specifications
| 재료 | Nickel-chromium-molybdenum alloy steel associated with AISI 4340 |
|---|---|
| Grade requirement | 인증됨 ASTM A320/A320M Grade L43 bolting, not generic 4340 bar |
| Low-temperature test | Charpy impact testing at the ordered temperature and acceptance criteria |
| 구성 | Fully threaded stud bolt; double-end studs by approved drawing |
| 스레드 | 유엔사, 8UN or project-specified series and class to ASME B1.1 |
| 치수 | ASME B18.31.2, flange bolting schedule or approved drawing |
| Matching nuts | Compatible ASTM A194 grade with required low-temperature qualification |
| 선적 서류 비치 | MTC, 화학, 열처리, 인장, 경도, impact and dimensional results |
최종 치수, 공차, 열처리, 기계적 성질, 충격 또는 경도 요구 사항, coating and acceptance criteria follow the purchase order and the contractually specified standard edition.
Why specify this grade?
Select L43 only when the engineering design or material specification explicitly requires this high-strength low-temperature grade. It is valuable for demanding applications, but availability and achievable properties depend on diameter, melt chemistry, heat treatment and the required impact-test temperature.
Critical engineering note
아이시 4340 chemistry alone does not establish ASTM A320 L43 compliance. Do not publish or accept a generic minimum service temperature without checking the contract edition, impact test data, governing code and complete joint design.
마개, nut and finish options
일반적인 애플리케이션
품질, 검사 및 문서화
L43 orders receive material and manufacturing review before commitment because diameter, 화학, heat treatment and impact-test temperature interact. The final certificate package records the evidence required by the approved inspection plan.
- EN 10204 3.1 material test certificate when ordered
- Heat-number and manufacturing-batch traceability
- Chemical composition and mechanical-property results
- Hardness testing at the frequency required by the ordered grade
- Charpy impact testing for low-temperature grades as specified
- Dimensional inspection and calibrated thread gauging
- Coating thickness or surface-condition inspection when applicable
- Third-party inspection, marking and export packing by agreement
견적에 필요한 정보
- ASTM standard, grade and contractually required edition
- Stud diameter, 전체 길이, thread series and thread class
- Quantity and whether two nuts per stud are required
- Matching nut specification, 등급, style and finish
- Plain, coated or plated finish and the approved coating system
- Design temperature, impact-test temperature and sour-service requirements when relevant
- MTC, PMI, 경도, 영향, coating and third-party inspection requirements
- 배송지, packing method and required schedule
자주 묻는 질문
What material is ASTM A320 L43?
L43 is a low-temperature bolting grade associated with AISI 4340 nickel-chromium-molybdenum alloy steel and must meet ASTM A320/A320M requirements.
Is generic AISI 4340 threaded bar equivalent to L43?
아니요. L43 compliance also depends on heat treatment, 기계적 성질, 충격 테스트, 치수, manufacturing controls and certification to the ordered ASTM A320 판.
What is the minimum temperature for L43 stud bolts?
Do not use a universal product-page value. The purchase order must identify the required impact-test temperature and the designer must establish the allowable service temperature under the governing code.
Which nuts are used with L43 stud bolts?
Use the compatible ASTM A194 or project-specified nut grade required by the design, including any low-temperature impact testing, hardness and documentation requirements.
Related stud bolt products
Reference standards
Material requirements are controlled by ASTM A320/A320M. Matching heavy hex nut requirements are specified separately under ASTM A194/A194M 해당되는 경우. Thread form and stud dimensions may reference ASME B1.1 그리고 ASME B18.31.2, subject to the purchase order. Always state the required edition instead of assuming the latest edition applies to an existing project.
기술 견적 요청
Send your flange bolting schedule, bill of materials, 도면 또는 프로젝트 사양. SASA FLANGE 성적을 검토할 것이다, 견과류, 스레드, 치수, 마치다, 견적 전 문서 및 배송 요구 사항.
