AASHTO/AWS D1.5:2025 · 表12.8 · 破壊臨界

M270M HPS690W予熱 — 1.2–1.6 kJ/mm、6–10 mm: 100–150°F

AASHTO/AWS D1.5:2025（橋梁溶接規格）に基づく、6–10 mm (1/4–3/8 in)板厚におけるM270M HPS690W / M270 HPS100Wの破壊臨界予熱要件。

AWS D1.5:2025に基づく — すべての値は条項に追跡可能。

破壊臨界予熱範囲

100–150°F / 40–60°C

表12.8 — 6–10 mm (1/4–3/8 in)板厚での1.2–1.6 kJ/mm入熱

AASHTO/AWS D1.5M/D1.5:2025 表12.8

予熱・パス間温度の最低値と最高値の両方を維持する必要があります。150°Fを超えるとQ&Tミクロ組織を劣化させるリスクがあります。

参考ツール。プロジェクト適用版およびエンジニア承認済みWPSで確認すること。

AASHTO M270 High-Performance Grades

M270M HPS690W / M270 HPS100W

AASHTO M270M HPS690W (M270 HPS100W) is the highest-strength bridge steel at 690 MPa (100 ksi) yield, reserved for the most demanding long-span and cable-stayed bridge applications. It follows a completely different FC preheat table (Table 12.8) with min-max ranges and many prohibited thickness-heat input combinations marked with “—”. Table 12.8 requires H4 or H8 designated consumables; H16 is not permitted. NFC preheat per Table 6.3 Group 2; maximum interpass per Table 6.4 is 205°C (400°F) for material up to 40 mm, 230°C (450°F) above.

橋梁への適用

M270M HPS690W / M270 HPS100Wの使用箇所

Reserved for the most demanding long-span and cable-stayed bridge applications where maximum weight reduction justifies the material cost premium and fabrication complexity. Table 12.8 imposes both minimum AND maximum preheat limits, and many thickness-heat input combinations are outright prohibited. Fabricators must plan weld procedures around the permitted combinations before cutting plate. Filler metals must carry the H4 or H8 supplemental designator — H16 is not permitted for HPS690W FC applications.

製作の詳細

6–10 mm (1/4–3/8 in)でのM270M HPS690W / M270 HPS100W

HPS690W (HPS100W) at up to 20 mm is used in deck plate and stiffener components on orthotropic steel deck bridges — specialized long-span applications where the 100 ksi yield enables very thin plate to carry traffic loads. Table 12.8 requires both min and max preheat even at this thin section, and several heat input combinations are prohibited. Only H4 or H8 consumables are permitted; H16 is not allowed at any thickness.

予熱範囲が必要

M270M HPS690W / M270 HPS100Wの最低–最高予熱管理

Highest-strength 690 MPa (100 ksi) bridge steel with restricted FC combinations. Table 12.8 specifies a preheat RANGE of 100–150°F for this thickness and heat input combination. Unlike other FC grades, HPS690W requires both minimum AND maximum preheat control because the Q&T microstructure is sensitive to both excessive and insufficient heat. Many thickness-heat input combinations are prohibited ("—" in the table) because no safe preheat window exists — the steel cannot be reliably welded under those conditions.

他の板厚

1.2–1.6 kJ/mmでのM270M HPS690W / M270 HPS100W

インタラクティブ計算機

別の組み合わせを試す

D1.5橋梁予熱計算機を使用して、AASHTO M270鋼材の水素レベルと入熱の任意の組み合わせを検索できます。構造用鋼にはD1.1予熱計算機もご覧ください。

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