ASTM A334 Grade 1 Grade 3 Grade 6 Seamless Steel Tube

• Customization: Available
• After-sales Service: Technical/Sample/Quality
• Type: Seamless
• Model NO.: ASTM A334
• Material: Alloy Steel
• Surface Treatment: Black
• Usage: Boiler Pipe
• Section Shape: Round
• Transport Package: as Required
• Specification: 10-850mm
• Trademark: SHUNFU
• Origin: China
• Production Capacity: 30000tons/Year

Product Description

ASTM A334 Seamless and Welded Carbon and Alloy Steel Tubes for Low Temperature Service

seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
 

ASTM A334 Tubes Materials and Manufacture

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

ASTM A334 Tubes Chemical Composition

Element	Grade	Grade 3	Grade 6^A	Grade 7	Grade 8	Grade 9	Grade 11
Carbon, max	0.3	0.19	0.3	0.19	0.13	0.2	0.1
Manganese	0.40-1.06	0.31-0.64	0.29-1.06	0.90 max	0.90 max	0.40-1.06	0.60 max
Phosphorus, max	0.025	0.025	0.025	0.025	0.025	0.025	0.025
Sulfur, max	0.025	0.025	0.025	0.025	0.025	0.025	0.025
Silicon		0.18-0.37	0.10 min	0.13-0.32	0.13-0.32		0.35 max
Nickel		3.18-3.82		2.03-2.57	8.40-9.60	1.60-2.24	35.0-37.0
Chromium							0.50 max
Copper						0.75-1.25
Cobalt							0.50 max
Molybdenum							0.50 max

 

ASTM A334 Tubes Heat Treatment

1 All seamless and welded tubes, other than Grades 8 and 11, shall be treated to control their microstructure in accordance with one of the following methods:

1 Normalize by heating to a uniform temperature of not less than 1550 °F [845 °C] and cool in air or in the cooling chamber of an atmosphere controlled furnace.

2 Normalize as in 10.1.1, and, at the discretion of the manufacturer, reheat to a suitable tempering temperature.

3 For the seamless process only, reheat and control hot working and the temperature of the hot-finishing operation to a finishing temperature range from 1550 to 1750 °F [845 to 955 °C] and cool in a controlled atmosphere furnace from an initial temperature of not less than 1550 °F [845 °C].

4 Treat as in 6.1.3 and, at the discretion of the manufacturer, reheat to a suitable tempering temperature.

2 Grade 8 tubes shall be heat treated by the manufacturer by either of the following methods.

1 Quenched and Tempered-Heat to a uniform temperature of 1475 6 25 °F [800 6 15 °C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; quench by immersion in circulating water. Reheat until the pipe attains a uniform temperature within the range from 1050 to 1125 °F [565 to 605 °C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; cool in air or water quench at a rate no less than 300 °F [165 °C]/h.

2 Double NormalizedandTempered- Heat to a uniform temperature of 1650 6 25 °F [900 6 15 °C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; cool in air. Reheat until the pipe attains a uniform temperature of 1450 6 25 °F [790 6 15 °C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; cool in air. Reheat to a uniform temperature within the range from 1050 to 1125 °F [565 to 605 °C]; hold at this temperature for a minimum time of 1 h/in. [2 min/mm] of thickness but in no case less than 15 min; cool in air or water quench at a rate not less than 300 °F [165 °C]/h.

3 Material from which impact specimens are obtained shall be in the same condition of heat treatment as the finished tubes.

4 Whether to anneal Grade 11 tubes is per agreement between purchaser and supplier. When Grade 11 tubes are annealed they shall be normalized in the range of 1400 to 1600 °F [760 to 870 °C]
 

ASTM A334 Tubes Test and Inspection

Transverse Tension Test
Flattening Tests
Hydrostatic Test
Nondestructive Electric Test
Flattening Test
 

ASTM A334 Tubes Ordering Information

Orders for material under this specification should include the following, as required to describe the desired material adequately:
1 Quantity (feet, metres, or number of lengths),
2 Name of material (seamless or welded tubes),
3 Grade
4 Size (outside diameter and minimum wall thickness),
5 Length (specific or random),
6 Optional requirements (other temperatures; hydrostatic or electric test),
7 Test report required, (Certification Section of Specification A1016/A1016M),
8 Specification designation, and
9 Special requirements and any supplementary requirements selected.