ASTM A333 Grade 7 Steel Pipe for Low Temperature Boiler Tube

ASTM A333 Gr. 7 Seamless and Welded Steel Pipe for Low             Temperature Service

The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.

Specification:

Chemical Composition(%)

Heat Treatment Requirements:

All seamless and welded pipe shall be treated to control their microstructure by the following methods:

Normalizing per ASTM A333 Standard Specification for Seamless and Welded Steel Pipe for Low Temperature Service section 4.2.1.1; section 4.2.1.2 or section 4.2.1.3
Quenched and Tempered per A 333/A 333M – 05 section 4.2.2.1
Double Normalized and Tempered per A 333/A 333M – 05 section 4.2.2.2

Referenced Documents:

ASTM A 370 Test Methods and Definitions for Mechanical testing of Steel Products
ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.
ASTM A 671 Specification for General requirements for Alloy and Stainless Steel Pipe
ASTM E 23 Test Methods for Notched bar Impact testing of Metallic Materials

Testing:

1.Inspection and Test: Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test,No-destructive Test, Hydrostatic Test.

2.For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot.
3.For small lots, at least one pipe shall be tested.
4.For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.
5.Hydrostatic Test
6.Impact Test One notched bar impact test, consisting of breaking three specimens shall be made from each heat represtented in a heat-treatment load on specimens taken from the finished pipe.

Packing:

Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.

Delivery:

Pipes are supplied in hexagonal bundles or round bundles tied with steel strip.
Weight of bundle – up to 5000 kg upon request of customer.
Each bundle is furnished with three tags.