Scope: This specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperature. Several grades of  ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.

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

Quality Standard:ASTM A333 Standard Specification for Seamless and Welded Steel Pipe for Low Temperature Service

Grades:  Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, Grade 11

Size Range:

1. Outer Dimensions: 19.05mm-457mm
2. Wall Thickness:2.0mm-60mm
3. Lengths: Lengths required shall be specified on order.If no definite lengths required, following practice applies:

• Single Random — 17′ ~ 24′ lengths
• Double Random — 36′ ~ 44′ lengths

Chemical Composition(%):

Grade	C	Mn	Si	P	S	Cr	Ni	Mo	Cu	V	Co	Nb	Al
Grade 1	0.30 max	0.40-1.06	/	0.025 max	0.025 max	/	/	/	/	/	/	/	/
Grade 3	0.19 max	0.31-0.64	0.18-0.37	0.025 max	0.025 max	/	3.18-3.82	/	/	/	/	/	/
Grade 4	0.12 max	0.50-1.05	0.08-0.37	0.025 max	0.025 max	0.44-1.01	0.47-0.98	/	/	0.40-0.75	/	/	0.04-0.30
Grade 6	0.30 max	0.29-1.06	0.10 min	0.025 max	0.025 max	/	/	/	/	/	/	/	/
Grade 7	0.19 max	0.90 max	0.13-0.32	0.025 max	0.025 max	/	2.03-2.57	/	/	/	/	/	/
Grade 8	0.13 max	0.90 max	0.13-0.32	0.025 max	0.025 max	/	8.40-9.60	/	/	/	/	/	/
Grade 9	0.20 max	0.40-1.06	/	0.025 max	0.025 max	/	1.60-2.24	/	0.75-1.25	/	/	/	/
Grade 10	0.20 max	1.15-1.50	0.10-0.35	0.035 max	0.015 max	0.15 max	0.25 max	0.05 max	0.15 max	0.12 max	/	0.05 max	0.06 max
Grade 11	0.10 max	0.60 max	0.35 max	0.025 max	0.025 max	0.50 max	35.0-37.0	0.50 max	/	/	0.50 max	/	/

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: 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.

• For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot.
• For small lots, at least one pipe shall be tested.
• 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.
• Hydrostatic Test
• 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.

Surface treatment: Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.

Required Markings on Each Length (On Tags attached to each Bundle in case of Bundled Pipe):

Markings will adhere to prescribed specifications in A 999/A999M and be: Rolled, Stamped, or Stenciled (Mfrs. Option)
In addition, markings will include:

• Hot Finished or Cold Drawn Manufacture Name
• Specification / Grade Hydro or NDE
• Seamless or Welded
• Schedule Number

the letters “LT” followed by the temperature at which the impact tests were made * and ** the letters “QT” when the pipe is furnished in the quenched and tempered condition * except when a lower test temperature is required because of reduced specimen size, in which case, the higher impact test temperature applicable to a full size specimen would be marked ** when the size of the finished pipe is insufficient to obtain subsize impact specimens, the marking shall not included the letters “LT” followed by an indicated test temperature unless Supplementary Requirement S! is specified.

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..