수업 600 대 클래스 900 합금강 플랜지

기술 뉴스검토됨: 3 팔월 2026에 의해 SASA FLANGE 기술콘텐츠팀

직접적인 답변

수업 900 flanges generally have heavier dimensions and a higher pressure-temperature rating than Class 600 flanges of the same material and size, but the class number is not a pressure in psi. Select the class from the applicable ASME rating table for the exact material group and design temperature, then verify dimensions, 탈당, 깃 달기, connected equipment and system loads.

주요 시사점

수업 600 is not limited to 600 psi, 및 클래스 900 is not limited to 900 psi.
Material group and temperature change the available pressure rating.
Changing class affects the entire joint and may affect connected equipment.

What the pressure class designation means

ASME pressure class is a rating designation, not a direct pressure value. The allowable working pressure at a given temperature is found in the adopted standard’s pressure-temperature tables for the material group. As temperature rises, available pressure commonly falls because material strength changes.

안 ASTM A182 F22 flange and an F91 flange can have the same Class 600 designation yet require separate rating-table review. The governing piping code, design margin and any owner limits also apply.

Physical and commercial differences

Factor	수업 600	수업 900
평가	Lower than Class 900 for the same material and temperature	Higher than Class 600 for the same material and temperature
기하학	Class-specific thickness, hub and bolting	Generally heavier class-specific geometry
Weight and cost	Generally lower	Generally higher due to material, machining and bolting
Interchangeability	Not assumed; mating class, 치수, facing and equipment rating must match

The exact dimensional difference varies by NPS, flange type and standard. Use controlled tables or manufacturer drawings rather than a generic weight factor.

A five-step class selection workflow

Confirm design pressure, design temperature and upset cases.
Identify the exact material specification, grade and ASME material group.
Use the adopted ASME B16.5 or B16.47 rating table.
Check flange type, 깃 달기, 틈 메우는 물건, bolting and the mating equipment class.
Verify external loads, cyclic duty and any project margin or derating.

Do not upgrade one flange to Class 900 without checking the mating flange, 판막, 대통 주둥이, 틈 메우는 물건, bolting and available installation space. The weakest approved component or joint condition can control the system.

What buyers should state in the RFQ

ASME standard and edition
NPS, 수업 600 또는 900, and flange type
ASTM A182 grade and required condition
RF or RTJ facing, finish and gasket reference
Pipe schedule, bore and weld-end detail
Bolting specification when supplied as a joint package
PMI, 경도, 임사체험, dimensional and MTC requirements

If the supplier is expected to review suitability, provide the design conditions and line-class reference. A manufacturer cannot derive the complete system design from size and class alone.

자주 묻는 질문

Does Class 600 mean 600 psi?

아니요. It is a class designation. The permitted pressure depends on material group, temperature and the adopted ASME standard edition.

Can a Class 900 flange bolt to a Class 600 플랜지?

Do not assume compatibility. 치수, 탈당, facing and ratings differ, and the joint requires engineering review.

Is Class 900 always the safer choice?

아니요. It must be compatible with the complete system and does not correct an unsuitable material, 틈 메우는 물건, bolting or weld design.

참조된 기본 표준

게시자 페이지를 기준으로 표준을 확인했습니다. 3 팔월 2026. 항상 프로젝트에서 지정한 에디션을 구매하여 적용하세요..

합금강 플랜지 견적 요청

재료 등급 보내기, 기준, NPS, 압력 등급, 플랜지형, 깃 달기, 파이프 일정, 수량 및 검사 요구 사항. 우리 팀은 견적 전에 기술 설명을 검토합니다..

견적 요청 보내기 플랜지 제품 보기