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规范涵盖了无缝和焊接结构的锻造碳钢和合金钢配件。这些配件用于压力管道和压力容器制造，可在中高温下使用。配件的材料应由镇静钢、锻件、棒材、板材、无缝或熔焊管状产品组成，并添加填充金属。锻造或成形操作可以通过锤击、压制、穿孔、挤压、镦粗、轧制、弯曲、熔焊、机加工或通过这些操作中的两种或多种的组合来进行。成型程序的应用应使其不会在配件中产生有害的缺陷。配件在高温下成型后，应在适当条件下冷却至临界范围以下的温度，以防止冷却过快造成的有害缺陷，但在任何情况下，冷却速度不得超过静止空气中的冷却速度。配件应进行拉伸试验、硬度试验和静水压试验。

What is A234 WPB steel pipe fitting?什么是A234 WPB钢管配件？

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钢管配件是指材料为ASTM A234 WPb的管件，用于中高温服务的压力管道系统。ASTM A234是管件材料的标准，它表明了不同种类碳钢和合金钢的材料性能，WPB是该标准中的钢种之一。W表示可焊接，P表示压力，B表示B级，指最小屈服强度，如astm A106 A53、Gr.B或API 5L Gr.B.A234 WPB是最常见的碳钢管件材料。
W=可焊接/锻造
P=与合金材料的P数有关
B=指材料的最小产量

What is the manufacturing process of ASTM A234 WPB pipe fittings?ASTM A234 WPB管件的制造工艺是什么？

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对任何过程都不缺人手。它只是ASTM开发的标识符。相关配件的制造方式与本规范中的配套管相同。
在非常大的尺寸中，配件可以分块制造并焊接在一起，就像许多大型配件一样。
用于制造的术语称为“锻造”，这意味着它是经过加工的，而不是铸造或锻造的。
至于代表可焊接的W，我不确定这是否正确，因为有很多可焊接的管件，但它们的名称不是W。请注意下面的参考。

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.

中高温用锻制碳钢和合金钢管道配件标准规范
本标准涵盖了根据ASME B16.9和B16.28的尺寸规范制造的无缝和焊接结构的锻造碳钢配件。这些配件主要用于压力管道和压力容器制造，以在中高温下使用。

Chemical Composition (%) of ASTM A234/A234M的化学成分（%）

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.

笔记：
对于低于规定C最大值0.01%的每一次减少，将允许高于规定最大值0.06%的Mn增加，最高可达1.35%。
铜、镍、铬和钼的总和不得超过1.00%。
铬和钼的总和不得超过0.32%。
根据热分析和公式C.E.=C+Mn/6+（Cr+Mo+V）/5+（Ni+Cu）/15，最大碳当量（C.E.）应为0.50。

Mechanical properties of ASTM A234的机械性能