HSAW pipes is an important indicator to measure quality of steel pipe.
为了测量钢管的硬度通常使用三个Brinell，Rockwell，维克斯硬度指数。
钢管的Brinell硬度：Brinell硬度广泛用于钢铁标准，经常通过压痕直径来表示材料的硬度，无论是直观和方便的。但对于硬或薄钢管不适用。
钢管的罗克韦尔硬度：钢管罗克韦尔硬度试验是使用压痕试验方法作为Brinell硬度测试的Sames。不同的是它是测量压痕的深度。钢管试验的罗克韦尔硬度是一个非常广泛的应用，包括HB的Brinell硬度后的HRC钢管标准。罗克韦尔硬度适用于测定极其柔软的金属材料，它弥补了Brinell方法不高于Brinell方法简单，可以直接从硬度机器硬度值直接读取。然而，由于其小压痕硬度值，因为Brinell方法是准确的。
Vickers hardness of the steel pipe: steel pipes Vickers hardness test is also a indentation test method for the determination of a thin metal material and the surface layer hardness. It has a Brinell, Rockwell law of the major advantages to overcome the basic shortcomings, but not as good as the Rockwell method is simple, Vickers method is rarely used in the steel pipe standards.
LSAW和HSAW是锯（埋弧焊）管道的变型。它们之间的差异是它们的焊接方式。在LSAW管中，焊接是纵向的，这意味着钢（热轧卷板）卷成管道，纵向焊接接缝。在辉刀型中，钢圈线圈螺旋地焊接，如螺旋，使得线圈（条带）呈现管道的形状。锯管主要用于石油和天然气运输。
螺旋埋弧焊钢管(螺旋)is the full name of hsaw pipe, to the strip into the welded pipe unit, the multi-roll rolling, the strip gradually rolled up to form a circular tube with an open gap, adjust the reduction of squeezing roller so that the weld gap control in 1 - 3mm, and make both ends of the weld flush. Spiral welded pipe is formed by forming the material strip spiral molding, through internal and external submerged arc welding, thus producing different specifications of the spiral welded pipe.
螺旋埋弧焊钢管(螺旋)has many advantages over other welded pipe:
(A)The pipe has two overlapping inner and outer spiral weld, play a role in increasing the rigidity, bearing pressure also increased accordingly.
（b）使用埋弧焊过程，渣保护效果。因此，它具有良好的冲击韧性和低温性能。
(C)The use of the same width of the strip can produce different diameters and lengths of steel, and straightness good. Easy to adjust, precise size, without sizing and straightening after welding.
specification, Standard and identificationWelded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.
