ASTM A234/A234M specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures. The material for fittings shall consist of killed steel, forgings, bars, plates, seamless or fusion-welded tubular products with filler metal added. Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations. The forming procedure shall be so applied that it will not produce injurious imperfections in the fittings. Fittings, after forming at an elevated temperature, shall be cooled to a temperature below the critical range under suitable conditions to prevent injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air. The fittings shall be subjected to tension test, hardness test, and hydrostatic test.

ASTM A234/A234M規範涵蓋了無縫和焊接結構的鍛造碳鋼和合金鋼配件。這些配件用於壓力管道和壓力容器製造，可在中高溫下使用。配件的材料應由鎮靜鋼、鍛件、棒材、板材、無縫或熔焊管狀日皮视频APP下载組成，並添加填充金屬。鍛造或成形操作可以通過錘擊、壓製、穿孔、擠壓、鐓粗、軋製、彎曲、熔焊、機加工或通過這些操作中的兩種或多種的組合來進行。成型程序的應用應使其不會在配件中產生有害的缺陷。配件在高溫下成型後，應在適當條件下冷卻至臨界範圍以下的溫度，以防止冷卻過快造成的有害缺陷，但在任何情況下，冷卻速度不得超過靜止空氣中的冷卻速度。配件應進行拉伸試驗、硬度試驗和靜水壓試驗。

What is A234 WPB steel pipe fitting?什麽是A234 WPB鋼管配件？

A234 WPB steel pipe fittings mean the pipe fitting which material is ASTM A234 WPB,they are used for the pressure piping systems of moderate and high temperature services.ASTM A234 is the standard of pipe fittings material,it indicates the materials properties of different kinds of carbon steel and alloy steel,WPB is one of the steel grade in this standard.W means weldable,P means pressure,B is grade b,refer to the minimum yield strength,like the astm A106 A53,Gr.B or API 5L Gr.B.A234 WPB is the most common carbon steel pipe fittings material.

W = WELDABLE / wrought
P = RELATED TO P NUMBER OF ALLOY MATERIAL
B = REFER TO MINIMUM YIELD OF MATERIAL

A234 WPB鋼管配件是指材料為ASTM A234 WPb的管件，用於中高溫服務的壓力管道係統。ASTM A234是管件材料的標準，它表明了不同種類碳鋼和合金鋼的材料性能，WPB是該標準中的鋼種之一。W表示可焊接，P表示壓力，B表示B級，指最小屈服強度，如astm A106 A53、Gr.B或API 5L Gr.B.A234 WPB是最常見的碳鋼管件材料。
W=可焊接/鍛造
P=與合金材料的P數有關
B=指材料的最小產量

What is the manufacturing process of ASTM A234 WPB pipe fittings?ASTM A234 WPB管件的製造工藝是什麽？

The WPB is not short hand for any process. It is simply an identifier developed by ASTM. The fittings in question are manufactured in the same manner as the companion pipe for this specification.

In very large sizes, the fittings may be manufactured in pieces and welded together as is the case for many large fittings.

The term used for the manufacturing is called “wrought” which means it is worked as opposed to being cast or forged.

As to the W standing for weldable, I’m not sure that is correct since that are many, many pipe fittings that are weldable but carry designations other than a W. Note the reference below.

WPB對任何過程都不缺人手。它隻是ASTM開發的標識符。相關配件的製造方式與本規範中的配套管相同。
在非常大的尺寸中，配件可以分塊製造並焊接在一起，就像許多大型配件一樣。
用於製造的術語稱為“鍛造”，這意味著它是經過加工的，而不是鑄造或鍛造的。
至於代表可焊接的W，我不確定這是否正確，因為有很多可焊接的管件，但它們的名稱不是W。請注意下麵的參考。

ASTM A234/A234M-07

Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

This standard covers wrought carbon steel fittings of seamless and welded construction which are manufactured to the dimensional specifications of ASME B16.9 and B16.28. These fittings are primarily for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures.

中高溫用鍛製碳鋼和合金鋼管道配件標準規範
本標準涵蓋了根據ASME B16.9和B16.28的尺寸規範製造的無縫和焊接結構的鍛造碳鋼配件。這些配件主要用於壓力管道和壓力容器製造，以在中高溫下使用。

Chemical Composition (%) of ASTM A234/A234M的化學成分（%）

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.

筆記：
對於低於規定C最大值0.01%的每一次減少，將允許高於規定最大值0.06%的Mn增加，最高可達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%。
根據熱分析和公式C.E.=C+Mn/6+（Cr+Mo+V）/5+（Ni+Cu）/15，最大碳當量（C.E.）應為0.50。

Mechanical properties of ASTM A234的機械性能