Alloy Steel A335 P5 Seamless Welded Pipes With Sch80 XS SCH120

Alloy Steel A335 P5 Seamless Pipes With Thickness Of Sch80, XS, SCH120

An Alloy Steel Pipe is used in applications which require moderate corrosion resistance properties with good durability and at
an economical cost. To simply put it, alloy pipes are preferred in those areas where carbon steel pipes may fail. There are two
classes of alloy steels - high alloys and low alloy steels.

Low alloy piping materials are often called chrome moly materials because of the
chemical makeup of Molybdenum (Mo) and Chromium (Cr). Chromium increases the hardness and strength and only minimally reduces
elasticity. Molybdenum improves tensile strength and especially heat resistance.

High alloy steel is an alloy of iron which contains 10.5% of chromium. High alloy steel also has a mixture of 10% alloy.
Chromium makes a thin layer of oxide on the surface of the steel and it is known as latent layer. And it is little costly than low alloy steel.

roduct Information/Product Description/Basis Information/Specification

Technology/ Technical Data Sheets

Thickness List for seamless pipes as per ANSI B36.10

Unit: MM

Dimension Design

OD … Outside Diameter

ID … Inside Diameter

WT … Wall Thickness

L … Length

If minimum wall thickness is required variations are allowed on the plus side only

Butt Welding Ends

ANSI / ASME B16.25-2007

Fig. 4 Weld Bevel Details for GTAW Root Pass [WT > 3mm (0,12 in.) to 10mm (0,38 in.), Inclusive]

GENERAL NOTES:

a) This detail applies for gas tungsten arc welding (GTAW) of the root pass where nominal thickness is over 3mm

b) Linear dimensions are in millimeters with inch values in parentheses.

Straightness Requirement 

tandard pipes and tubes are supplied straightened to the eye: for special applications the

permissible deviation from the straight line may be agreed between purchaser and pipe

manufacturer; the maximum permissible deviation from the straight line related

to the length of measurement L is to be indicated, e.g. 1mm/1000mm.

Eccentricity

E is half of the difference between biggest and smallest

wall thickness (WT) values in one cross section.  

In terms of mm:

However, eccentricity is expressed as a percentage of the mean wall thickness of this cross section

Mean Diameter inside and outside 

D0 is the arithmetic mean between the smallest and biggest tube diameter on any one pipes or tube

circumference. If minimum wall thickness is required variations are allowed on the plus side only

Ovality

O is the difference between biggest and smallest diameter on any one tube circumference

As a percentage of the mean diameter this is:

Ovality must not be confused with eccentricity.

SEAMLESS PIPE MANUFACTURING PROCESS

Mild steel seamless pipes from 1/8 to 24 inch. are manufactured with the

so-called “plug mill process” or the “extrusion process” (used for smaller diameters),

whereas the “mandrel mill process” is used for larger diameters.

Application/Usage

Seamless steel pipes are used for different applications within the oil & gas industry:

•upstream operations (OCTG pipes)

•midstream (transmission and distribution of fluids, as oil, gas, steam, acids, slurries)

•downstream (process piping to refine oil and gas in derivative products)

•general plumbing applications for utility services

FAQ: Question and Answers 

Q: What is the different between seamless pipes and seamless Tubes?

A: Seamless steel pipes shall not be confused with seamless tubes. Indeed, there are a few important differences between pipes and tubes, which are not only semantic. In general, the word “pipe” applies to any tubular used to convey fluids, whereas the word “tube” applies to tubular sections (of various shapes, round, oval, squared) used for structural/mechanical applications, instrumentation systems, and the construction of pressure equipment like boilers, heat exchangers, and superheaters.

Q: What is the tolerance of the seamless pipes

A: Dimensions tolerance for API 5L /A106GR.B seamless pipe.

1. For outer diameters less than 2 3/8 in (60.3 mm), pipe body diameter tolerance +/-0.5 mm. Pipe end +/- 0.5 mm; Out of Roundness tolerance for pipe body is 0.9 mm (0.036 in), pipe end 0.6 mm (0.024 mm).

2. For OD equal or above 2 3/8 in (60.3) to 24 in (610 mm), (diameter tolerance) for pipe body is +/- 0.0075D,pipe end +/- 0.005D but max to +/-1.6 mm (0.063mm);

Roundness tolerance for pipe body≤0.015D, pipe end≤0.01D.

(In case agreed with manufacturer and client, more strictly tolerances could be applied)

3. For wall thickness

Below than 4 mm (0 0157 in), tolerance +0.6 (0.024 mm), -0.5 mm (0.020 in);

For API 5L seamless steel pipe thickness in 4 mm to 10 mm (0.394 in), +0. 150t, -0.125t;

For API seamless pipe thickness 10 mm to 25mm (0.984 in), +/-0.125t;

Wall thickness≥25 mm, +3.7mm or +0.1t (if larger) and -3.0 mm (0.120 in) or -0.1t (if larger).

t for thickness,

4. For straightness, max for full length, tolerance maximum 0.15% of length.

5. Straightness, max deviation for pipe end, shall be≤0.3 mm /m.

6. Length +/- 200 mm for general, +/- 25.4 mm for special.