ASTM A333 Standard Specification

ASTM A333 is the Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service.

ASTM A333 standard covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. ASTM A333 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their microstructure. Tensile tests, impact tests, hydrostatic tests, and nondestructive electric tests shall be made in accordance to specified requirements.

ASTM A333  Specification for Seamless and Welded Steel Pipe for Low-Temperature Service. Our products for ASTM A335 alloy steel pipes have been listed as follows:

ASTM A333 Grade 8 ASTM A333 Grade 6 ASTM A333 Grade 3 ASTM A333 Grade 9

ASTM A333 Grade 7 ASTM A333 Grade 10 ASTM A333 Grade 4 ASTM A333 Grade 1

Scope of ASTM A333
This specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of ferritic steel are included as listed in Table 1. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser.
The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.
Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter”, “size”, and “nominal size”.

Strike temperature condition：

Crade	The lowest temperature for strike test
	℉	℃
ASTM A333 Grade 1	-50	-45
ASTM A333 Grade 3	-150	-100
ASTM A333 Grade 4	-150	-100
ASTM A333 Grade 6	-50	-45
ASTM A333 Grade 7	-100	-75
ASTM A333 Grade 8	-320	-195
ASTM A333 Grade 9	-100	-75
ASTM A333 Grade 10	-75	-60

Mechanical requiremnts of ASTM A333 alloy pipe

Standard	Grade	Tensile Strength (MPa）	Yield Point (MPa)	Elongation (%)
				Y	X
ASTM A333	Grade 1	≥380	≥205	≥35	≥25
	Grade 3	≥450	≥240	≥30	≥20
	Grade 4	≥415	≥240	≥30	≥16.5
	Grade 6	≥415	≥240	≥30	≥16.5
	Grade 7	≥450	≥240	≥30	≥22
	Grade 8	≥690	≥515	≥22
	Grade 9	≥435	≥315	≥28
	Grade 10	≥550	≥450	≥22
	Grade 11	≥450	≥240	≥18

 

Chemical Composition (%) of ASTM A333 steel pipe

Standard

Grade

Chemical Composition (%)

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

Al

ASTM A333

Grade 1

≤0.30

0.40-1.06

≤0.025

≤0.025

Grade 3

≤0.19

0.18-0.37

0.31-0.64

≤0.025

≤0.025

3.18-3.82

Grade 4

≤0.12

0.18-0.37

0.50-1.05

≤0.025

≤0.025

0.44-1.01

0.47-0.98

0.40-0.75

0.04-0.30

Grade 6

≤0.30

≥0.10

0.29-1.06

≤0.025

≤0.025

Grade 7

≤0.19

0.13-0.32

≤0.90

≤0.025

≤0.025

2.03-2.57

Grade 8

≤0.13

0.13-0.32

≤0.90

≤0.025

≤0.025

8.40-9.60

Grade 9

≤0.20

0.40-1.06

≤0.025

≤0.025

1.60-2.24

0.75-1.25

Grade 10

≤0.20

0.10-0.35

1.15-1.50

≤0.03

≤0.015

≤0.15

≤0.25

≤0.015

≤0.50

≤0.12

≤0.06

Grade 11

≤0.10

≤0.35

≤0.6

≤0.025

≤0.025

≤0.50

35.0-37.0

≤0.50

Referenced Documents

• A370 Test Methods and Definitions for Mechanical Testing of Steel Products
• A671 Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
• A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
• E23 Test Methods for Notched Bar Impact Testing of Metallic Materials

Heat Treatment Requirements

	P5, P9, P11, and P22
Grade	Heat Treatment Type	Normalizing Temperature Range F [C]	Subcritical Annealing or Tempering Temperature Range F [C]
P5 (b,c)	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
	Subcritical Anneal (P5c only)	*****	1325 - 1375 [715 - 745]
P9	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
P11	Full or Isothermal Anneal
	Normalize and Temper	*****	1200 [650]
P22	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
P91	Normalize and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]
	Quench and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]

Chemical Requirements

		Grade	P-5	P-9	P-11	P-22	P-91	P-91 shall also include the following:
Element		UNS Designation	K41545	S50400	K11597	K21590	K91560
	Carbon		0.15 max	0.15 max	0.05 - 0.15	0.05 - 0.15	0.08 - 0.12	V at 0.18 - 0.25
	Manganese		0.30 - 0.60	0.30 - 0.60	0.30 - 0.60	0.30 - 0.60	0.30 - 0.60	N at 0.030 - 0.070
	Phosphorous, max		0.025	0.025	0.025	0.025	0.020	Ni at 0.40 max
	Sulfur, max		0.025	0.025	0.025	0.025	0.010	Al at 0.02 max
	Silicon		0.50 max	0.25 - 1.00	0.50 - 1.00	0.50 max	0.20 -0.50	Cb at 0.06 - 0.10
	Chromium		4.00 - 6.00	8.00 - 10.00	1.00 - 1.50	1.90 - 2.60	8.00 - 9.50	Ti at 0.01 max
	Molybdenum		0.45 -0.65	0.90 - 1.10	0.44 - 0.65	0.87 - 1.13	0.85 - 1.05	Zr at 0.01 max

Tensile Requirements

		Seamless
		P-5	P-9	P-11	P-22	P-91	P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
Tensile Strength, min., psi
	ksi	60	60	60	60	85
	MPa	415	415	415	415	585
Yield Strength, min., psi
	ksi	30	30	30	30	60
	MPa	205	205	205	205	415

Permissible Variation in Wall Thickness

NPS [DN] Designator	Tolerance, % from Specified
		Over		Under
1/8 to 2 1/2 [6 to 65] incl., all t/D ratios		20.0%		12.5%
Above 2 1/2 [65], t/D < or = 5%		22.5%		12.5%
Above 2 1/2 [65], t/D > 5%		15.0%		12.5%
(t = Specified Wall Thickness; D = Specified Outside Diameter)

Elongation Requirements

Calculated Minimum Elongation Values
Elongation in 2 in. or 50 mm, min %
Wall Thickness		P5, P9, P11, P22			P91
in.	mm	Longitudinal	Transverse		Longitudinal
5/16 (0.312)	8	30	20		20
9/32 (0.281)	7.2	28	19		19
1/4 (0.250)	6.4	27	18		18
7/32 (0.219)	5.6	26			17
3/16 (0.188)	4.8	24			16
5/32 (0.156)	4	22			15
7/8 (0.125)	3.2	21			14
3/32 (0.094)	2.4	20			13
1/18 (0.062)	1.6	18			12

Permissible Variations in Outside Diameter

Outside Diameter at any point shall not vary from standard specified more than:

NPS [DN] Designator	Over		Under
	in.	mm	in.	mm
1/8 to 1 1/2 [6 to 40], incl.	1/64 (0.015)	0.40	1/64 (0.015)	0.40
Over 1 1/2 to 4 [40 to 100], incl.	1/32 (0.031)	0.79	1/32 (0.031)	0.79
Over 4 to 8 [100 to 200], incl.	1/16 (0.062)	1.59	1/32 (0.031)	0.79
Over 8 to 12 [200 to 300], incl.	3/32 (0.093)	2.38	1/32 (0.031)	0.79
Over 12 [300]	+/- 1% of the specified outside diameter

Mechanical
Tests Specified

Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend 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.
	Notes for Hardness Test:	P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
	Notes for Bend Test:	For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
		Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
		The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.
		The inside diameter of the bend shall be 1 inch [25 mm].
Hydrostatic Test		Each length of pipe shall be Hydro tested, at option of manufacture, nondestructive electric testing can be used.

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:
	Length of pipe	Marking to indicate the test method(s) Hydrostatic Nondestructive Marking YES NO Test Pressure NO YES NDE NO NO NH YES YES Test Pressure/NDE
	Schedule Number
	Heat Number or Manufacturer's number by which heat can be identified
	An Additional Symbol "S" if the pipe conforms to any Supplementary Requirements
	S1 - Product Analysis
	S2 - Transverse Tension Test
	S3 - Flattening Test
	S4 - Metal Structure and Etching Tests
	S5 - Photomicrographs
	S6 - Photomicrographs for Individual Pieces
	S7 - Alternative Heat Treatment - Grade P91
	Pipe that has been weld repaired shall be marked "WR".

Reference Documents

• ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.
• ASTM E 213 Practice for Ultrasonic Examination of metal Pipe and Tubing
• ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
• ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings
• ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
• ASME B26.10M Welded and Seamless Wrought Steel Pipe

Ordering
Information

Orders for material under this specification should include the following, as required, to describe the desired material adequately:

Quantity	Feet, meters, or number of lengths
Name of material	Seamless Alloy Steel Pipe
Grade	P5, P9, P11, P22, P91
Manufacture	Hot-finished or cold-drawn
Size using one of the following:
NPS and Schedule Number
Outside Diameter and Nominal Wall Thickness
Outside Diameter and Minimum Wall Thickness
Inside Diameter and Nominal Wall Thickness
Inside Diameter and Minimum Wall Thickness
Length	Specific or Random