ASTM A234 WPB refers to a specific grade of carbon steel pipe fittings, which are widely used in pressure piping and pressure vessel fabrication for service at moderate and elevated temperatures.

ASTM A234 WPB is a widely accepted standard for manufacturing carbon steel pipe fittings that are safe and reliable for use in various industrial applications.

ASTM A234 covers wrought carbon steel and alloy steel fittings (both seamless and welded) that are covered by the latest revision of various industry standards, including ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. These fittings are typically used for conveying fluids and gases under high pressure and high temperature conditions.

ASTM A234 specification has many grades, with WPB being the most common grade used for medium and high-temperature pipelines.

ASTM A234 WPB is the most prevalent carbon steel grade for ASME B16.9 pipe fittings. Hot-formed WPB fittings upon which the final forming operation is completed at a temperature above 1150°F [620°C] and below 1800°F [980°C] need not be heat treated provided they are cooled in still air. Hot-formed WPB fittings finished at temperature in excess of 1800°F [980°C] shall subsequently be annealed, normalized, or normalized and tempered. Cold-formed WPB fittings, upon which the final forming operation is completed at a temperature below 1150°F [620°C], shall be normalized, or shall be stress relieved at 1100 to 1275 °F [595 to 690 °C]. The WPB fittings produced by fusion welding and having a nominal wall thickness at the welded joint of 3/4″ [19 mm] or greater shall be post-weld heat treated at 1100 to 1250 °F [595 to 675 °C].

ASTM A234 WPB是指一種特定等級(jí)的碳鋼管配件，廣泛應(yīng)用于壓力管道和壓力容器制造，用于中高溫環(huán)境。
ASTM A234 WPB是制造碳鋼管配件的廣泛接受的標(biāo)準(zhǔn)，這些配件在各種工業(yè)應(yīng)用中使用安全可靠。
ASTM A234涵蓋了各種行業(yè)標(biāo)準(zhǔn)最新版本所涵蓋的鍛造碳鋼和合金鋼配件（無縫和焊接），包括ASME B16.9、B16.11、MSS-SP-79、MSS-SP-83、MSS-SP-95和MSS-SP-97。這些配件通常用于在高壓和高溫條件下輸送流體和氣體。
ASTM A234規(guī)范有許多等級(jí)，其中WPB是用于中高溫管道的最常見等級(jí)。
ASTM A234 WPB是ASME B16.9管件中最常用的碳鋼等級(jí)。在1150°F[620°C]以上和1800°F[980°C]以下的溫度下完成最終成型操作的熱成型WPB配件，只要在靜止空氣中冷卻，就不需要進(jìn)行熱處理。在超過1800°F[980°C]的溫度下完成的熱成型WPB配件隨后應(yīng)退火、正火或正火和回火。在1150°F[620°C]以下的溫度下完成最終成型操作的冷成型WPB配件應(yīng)進(jìn)行正火處理，或在1100至1275°F[595至690°C]下進(jìn)行應(yīng)力消除。通過熔焊生產(chǎn)的WPB配件，其焊接接頭處的標(biāo)稱壁厚為3/4英寸[19毫米]或更大，應(yīng)在1100至1250°F[595至675°C]下進(jìn)行焊后熱處理。

Chemical Composition (%) of ASTM A234 WPB的化學(xué)成分（%）

Notes:

For each reduction of 0.01% below the specified C maximum, an increase of 0.06% Mn above the specified maximum will be permitted, up to a maximum of 1.35%.

The sum of Cu, Ni, Cr, and Mo shall not exceed 1.00%.

The sum of Cr and Mo shall not exceed 0.32%.

The maximum carbon equivalent (C.E.) shall be 0.50, based on heat analysis and the formula C.E.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.

對(duì)于低于規(guī)定C最大值0.01%的每一次減少，將允許高于規(guī)定最大值0.06%的Mn增加，最高可達(dá)1.35%。
銅、鎳、鉻和鉬的總和不得超過1.00%。
鉻和鉬的總和不得超過0.32%。
根據(jù)熱分析和公式C.E.=C+Mn/6+（Cr+Mo+V）/5+（Ni+Cu）/15，最大碳當(dāng)量（C.E.）應(yīng)為0.50。

Mechanical properties of ASTM A234 WPB的機(jī)械性能

Pipe elbows