Spiral pipe,SSAW pipe,SSAW pipe,Spiral Pipe Terminology

1. Product Name: SSAW pipe, SSAW steel pipe 
2. Size: OD 219mm-3200mm 
Wall Thickness 5mm-26mm 
SCH30, SCH40, STD, XS, SCH80, SCH160, XXS etc. 
3. Length: Less Than 12m 
4. Steel material: Q195 Grade B, SS330, SPHC, S185 Q215 Grade C, CS Type B, SS330, SPHC Q235 Grade D, SS400, S235JR, S235JO, S235J2

Our products strictly according to ISO9001 international quality system authentication.

SSAW Pipe/SAW Spiral Welded Pipe/Steel Pipe :

Detailed information:

Product Name	Spiral Tubing/Spiral Welded Pipe/SSAW Spiral Pipe
Size	OD:	219-3040mm
	Thickness:	3-30mm
	Length:	6m/9m/12m Or Other Size According To The Contract
Steel Material	Q195, Q215, Q235, Q345
Standard	GB/BS/ASTM/
Usage	Used For Gas, Petroleum, Water ,Oil, Structure And Sewage
Ends	Plain or Beveled (Can be Protected By Plastic Pipe Cap)
Surface	Bared Or Paint With Oil, Bitumen,1-3 layer PE (Outside Or Inside Anti-Corrosion Treatment Can Supply)

 

 

Spiral Pipe Terminology - hardness index

 

        Metallic materials against a hard surface of the object's ability indentation called hardness. According to different test methods and scope, can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. For pipes commonly used are Brinell, Rockwell, Vickers hardness of three.

A, Brinell hardness (HB)

　　With a certain diameter carbide ball or balls to predetermined test force (F) onto the design surface, the required hold time after removing the test force, the surface of the sample was measured indentation diameter (L) Brinell hardness is a spherical surface indentation test force divided by the quotient.

　　To HBS (ball), said unit N/mm2 (MPa) which is calculated as:

F - pressed into the surface of the metal sample test force N;

D - test with the ball diameter mm

d - indentation average diameter mm.

　　Brinell hardness measurement more accurate and reliable, but generally only in HBS 450N/mm2 (MPa) below the metal material, the hard steel or thin sheet is not applicable. In the steel standard, the most widely Brinell hardness, often indentation diameter d to represent the hardness of the material, both intuitive and convenient.

　　Example: 120HBS10/1000130: indicates the ball with a diameter of 10mm in 1000Kgf (9.807KN) test force, keeping 30s (seconds) measured Brinell hardness value of 120N / mm2 (MPa).

B, Rockwell hardness (HK)

　　Rockwell hardness test Brinell hardness test the same, as are the indentation test methods. The difference is that it is a measure of the depth of indentation.

　　That is, at the beginning of Yong test force (Fo) and the total test force (F) is successively under the action of pressure head (gold steel cone or ball) onto the surface of the sample, the specified hold time, the removable main test force, by measuring the residual indentation depth increment (e) calculation of hardness. A number whose value is unknown, the symbol HR that are used by the scale A, B, C, D, E, F, G, H, K, nine gauge. Which are commonly used in the steel hardness test scale is generally A, B, C, i.e. HRA, HRB, HRC. Hardness value calculated using the following formula: When A and C scale test, HR = 100-e When B scale test, HR = 130-e where e - Residual indentation depth increment, even based on the requirements unit 0.002mm, ie when an axial displacement of the indenter unit (0.002mm), that is equivalent to a Rockwell hardness number .

　　e higher the value, the lower the hardness of the metal, the higher the hardness and vice versa. Scope of the three scales as follows: HRA (diamond cone indenter) 20-88 HRC (diamond cone indenter) 20-70 HRB (1.588mm diameter steel ball indenter) 20-100 Rockwell hardness test is a very wide application The method, wherein the steel pipe used in the standard HRC after the Brinell hardness HB. Rockwell hardness suitable for determination by the extremely soft to extremely hard metal materials, which make up the Brinell method is not over Brinell method is simple, you can dial directly from the hardness tester hardness value readout. However, because of its small indentation, the Brinell hardness values as accurate.

C, Vickers hardness (HV)

　　Vickers indentation hardness test is a test method, the opposing surface is a positive angle of 1360 with quadrangular pyramidal diamond indenter selected pilot force (F) onto the test surface, the hold time after the drop test requirements force measuring indentation two diagonal length.

　　Vickers hardness test force value is divided by the surface area of the quotient indentation, which is calculated as:

HV - Vickers hardness symbol N/mm2 (MPa);

F - Test force N;

d - the arithmetic mean of the diagonals indentation mm.

Vickers hardness test force F is used in 5 (49.03), 10 (98.07), 20 (196.1), 30 (294.2), 50 (490.3), 100 (980.7) Kgf (N) such as six, can be measured hard degrees Values range from 5 ~ 1000HV.

　　Representation of an example: 640HV30/20 represents a 30Hgf (294.2N) test force 20S (s) Vickers hardness value measured 640N/mm2 (MPa). Vickers hardness method for the determination of a thin layer of metallic material and surface hardness. It has a Brinell, Rockwell The main advantage, while overcoming their basic shortcomings, but not as good as the Rockwell method is simple. Vickers method is rarely used in the steel standard.