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30 Juli 2026

Flensa A105 vs A182

Technical NewsDitinjau: 3 Agustus 2026By SASA FLANGE Tim Konten Teknis

Jawaban langsung

ASTM A105 is a carbon-steel forging specification for pressure-system piping components. ASTM A182 covers a family of low-alloy and stainless grades for pressure service, termasuk F11, F22, F91, F304L and F316L. Karena itu, a useful comparison is A105 versus a specific A182 grade, not A105 versus “A182” as though A182 were one material.

Poin-poin penting

  • A105 is a carbon-steel specification; A182 contains many alloy and stainless grades.
  • The material specification and the flange dimensional standard perform different jobs.
  • Substitution requires temperature, korosi, pengelasan, bolting and line-class review.

Material scope: one carbon grade versus a grade family

ASTM A105/A105M covers forged carbon-steel components for ambient and higher-temperature pressure systems. ASTM A182/A182M covers forged low-alloy and stainless piping components. The A182 grade suffix is essential because F22 and F316L, Misalnya, solve very different engineering problems.

Decision point ASTM A105 ASTM A182
Keluarga materi Baja karbon Multiple low-alloy and stainless grades
Complete order designation A105/A105M A182/A182M plus exact grade and condition
Common selection driver General pressure piping and economy Suhu, corrosion or grade-specific properties
Standar dimensi Specified separately, umumnya ASME B16.5 atau ASME B16.47 sebagaimana berlaku

When A105 is commonly selected

A105 is widely used in carbon-steel process, kegunaan, oil-and-gas and steam piping where the design code and material class permit it. Its economic advantage is meaningful when the service does not require the elevated-temperature performance of chrome-moly steel or the corrosion resistance of stainless steel.

That does not make A105 universal. Low-temperature toughness, sour-service restrictions, high-temperature strength, external corrosion and process-side corrosion still need review. A coating may protect an exterior surface, but it does not change the base metal into a corrosion-resistant alloy.

When an A182 grade is the better fit

Low-alloy A182 grades such as F11, F22 and F91 are selected within engineered high-temperature systems. Austenitic stainless grades such as F304L and F316L may be selected for corrosion resistance, cleanliness or low-temperature behavior. Duplex and other grades address additional combinations of strength and corrosion performance.

The designer should compare allowable stress at temperature, oxidation and corrosion mechanisms, ekspansi termal, kemampuan las, heat-treatment needs and compatibility with the adjoining pipe. Choosing an A182 grade only because its room-temperature tensile strength is higher is not an adequate basis.

How to write an unambiguous flange order

Separate the material requirement from the dimensional requirement. “4-inch Class 300 A182 flange” omits the grade, jenis, facing and bore. A reviewable description would state the ASTM grade, ASME standard, NPC, kelas, tipe flensa, facing and pipe schedule, followed by testing and documentation requirements.

  • Spesifikasi bahan, exact grade and edition
  • ASME standard, NPC, kelas, type and facing
  • Bore or weld end matched to the pipe schedule
  • Perawatan panas, impact testing and hardness limits where applicable
  • PMI, mati suri, coating and marking requirements
  • EN 10204 3.1 or other required inspection document

Pertanyaan yang sering diajukan

Adalah ASTM A182 stronger than ASTM A105?

That is too broad a comparison because A182 includes many grades. Compare the exact grade, perlakuan panas, section size and allowable stress at the design temperature.

Can an A105 flange connect to an A182 flange?

Only when the piping design approves the ratings, thermal behavior, corrosion effects, paking, bolting and any welding requirements.

Melakukan ASME B16.5 define A105 or A182 chemistry?

TIDAK. ASME B16.5 addresses flange dimensions and pressure-temperature rating rules; the ASTM material specification defines chemistry and material properties.

Related flange guides

ASTM A182 Flensa F11 vs F22 vs F91 Cara Memilih Flensa Baja Paduan untuk Layanan Suhu Tinggi What Buyers Should Check on an ASTM A182 Flange MTC

Standar primer yang dirujuk

Standards were checked against publisher pages on 3 Agustus 2026. Always purchase and apply the edition specified by the project.

Minta penawaran flensa baja paduan

Kirim nilai materi, standar, NPC, kelas tekanan, tipe flensa, menghadap, jadwal pipa, kuantitas dan persyaratan inspeksi. Our team will review the technical description before quotation.

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