Difference Between A671 and A672 EFW Pipes

A671 and A672 areEFW (Electric-Fusion Welded) Carbon Steel Pipes used for atmospheric and lower temperatures applications (A671) and high-pressure service at moderate temperatures (A672). As mentioned above, A671 is used for atmospheric and lower temperature application and A672 is used for high-pressure service applications at moderate temperature. However, if we compare the details e.g. A672 Gr.C60 & A671 Gr. CC60; the raw material plate used is same for both pipes & final mechanical properties are same. Heat treatment is same. The only difference between the 2 grades is only in the testing requirements. A672 requires weld sample drawn from a 500ft length of pipe and allows you to double the samples in case, original sample fails. A671 requires weld sample drawn from a 200ft length of pipe with no provision for a rejected weld.

Understanding difference in different grades

We come across different grades amongst A671 and A672 categories like CA/CB/CC (signified the type of plate used) and also different classes like CL 12/22/32 etc. We will attempt to explain these differences in the below table with simplified classification.

EFW Pipe Grade Plate Used Plate Grade Heat Treatment
ASTM A671 GR. CA45 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE A None
ASTM A671 GR. CA50 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE B None
ASTM A671 GR. CA55 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE C None
ASTM A671 GR. CB55 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 55 None
ASTM A671 GR. CB60 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 60 None
ASTM A671 GR. CB65 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 65 None
ASTM A671 GR. CB70 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 70 None
ASTM A671 GR. CC55 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 None
ASTM A671 GR. CC60 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 None
ASTM A671 GR. CC65 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 None
ASTM A671 GR. CC70 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 None
ASTM A671 GR. CA45 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE A Stress Relieved
ASTM A671 GR. CA50 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE B Stress Relieved
ASTM A671 GR. CA55 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE C Stress Relieved
ASTM A671 GR. CB55 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 55 Stress Relieved
ASTM A671 GR. CB60 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 60 Stress Relieved
ASTM A671 GR. CB65 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 65 Stress Relieved
ASTM A671 GR. CB70 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 70 Stress Relieved
ASTM A671 GR. CC55 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Stress Relieved
ASTM A671 GR. CC60 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Stress Relieved
ASTM A671 GR. CC65 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Stress Relieved
ASTM A671 GR. CC70 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Stress Relieved
ASTM A671 GR. CA45 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE A Normalized
ASTM A671 GR. CA50 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE B Normalized
ASTM A671 GR. CA55 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE C Normalized
ASTM A671 GR. CB55 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 55 Normalized
ASTM A671 GR. CB60 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 60 Normalized
ASTM A671 GR. CB65 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 65 Normalized
ASTM A671 GR. CB70 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 70 Normalized
ASTM A671 GR. CC55 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Normalized
ASTM A671 GR. CC60 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Normalized
ASTM A671 GR. CC65 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Normalized
ASTM A671 GR. CC70 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Normalized
ASTM A672 GR. CA45 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE A None
ASTM A672 GR. CA50 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE B None
ASTM A672 GR. CA55 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE C None
ASTM A672 GR. CB55 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 55 None
ASTM A672 GR. CB60 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 60 None
ASTM A672 GR. CB65 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 65 None
ASTM A672 GR. CB70 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 70 None
ASTM A672 GR. CC55 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 None
ASTM A672 GR. CC60 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 None
ASTM A672 GR. CC65 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 None
ASTM A672 GR. CC70 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 None
ASTM A672 GR. CA45 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE A Stress Relieved
ASTM A672 GR. CA50 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE B Stress Relieved
ASTM A672 GR. CA55 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE C Stress Relieved
ASTM A672 GR. CB55 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 55 Stress Relieved
ASTM A672 GR. CB60 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 60 Stress Relieved
ASTM A672 GR. CB65 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 65 Stress Relieved
ASTM A672 GR. CB70 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 70 Stress Relieved
ASTM A672 GR. CC55 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Stress Relieved
ASTM A672 GR. CC60 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Stress Relieved
ASTM A672 GR. CC65 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Stress Relieved
ASTM A672 GR. CC70 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Stress Relieved
ASTM A672 GR. CA45 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE A Normalized
ASTM A672 GR. CA50 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE B Normalized
ASTM A672 GR. CA55 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE C Normalized
ASTM A672 GR. CB55 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 55 Normalized
ASTM A672 GR. CB60 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 60 Normalized
ASTM A672 GR. CB65 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 65 Normalized
ASTM A672 GR. CB70 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 70 Normalized
ASTM A672 GR. CC55 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Normalized
ASTM A672 GR. CC60 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Normalized
ASTM A672 GR. CC65 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Normalized
ASTM A672 GR. CC70 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Normalized

The above classification should simplify any confusion with respect to different grades and classification. Apart from these, there are other classes like CL 10, CL13 and C42. The differences in due to Radiography and Test Pressure, for eh CL 10 does not need radiography as well as the pressure test, CL 13 does not need radiography but required Test Pressure, CL 42 needs the plate to be normalized as well as tempered with Radiography Testing and Test Pressure.

Steel imports In India decline to 4.5 million tons in April-October 2016

Steel imports in India have declined upto 39 percent  to 4.5 million tons amid April-October of this financial over a similar period a year prior. Steel Minister Chaudhary  Birender  Singh has said that The government has made different strides in light of a legitimate concern for the local steel industry from unfair foreign competition. Since the start of 2014-15, the Indian steel industry has seen serious worry because of surge in imports from nations saddled with abundance limit and fall in household costs.

 

Alloy Steel Pipes

What are Alloy Steel Pipes?

Alloy-Steel-Pipes

ASTM A335 Alloy Steel Pipes (ASME S/A335, Chorme-Moly) is a seamless ferritic Alloy Steel Pipes for high temperature service. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding.  Sometimes referred to as “P Grade”, chome moly pipe is popular in P-Grades P5, P9, P11, P22, and P91.  The most common use of grades P11, P22, and P91 is in the power industry and petro-chemical plants,  Grades P5 and P9 are commonly used  in refineries.

Read more

Steel Pipe Sales – US files Anti Dumping suit against Oman, UAE

US has filed an anti dumping lawsuit against Oman , United Arab Emirates, Pakistan, the Philippines and Vietnam for selling steel pipes below the fair price.

The US steel pipe makers, which lodged a complaint against dumping, are Bull Moose Tube Company, EXLTUBE, Wheatland Tube Company and Western Tube and Conduit .

The investigation would be carried for circular welded carbon-quality steel pipes.