SPE 74.003- ASTM 672

MESC SPECIFICATION May 2005 SPE 74/003 Page 1 of 3

PIPE, CARBON AND ALLOY STEEL ASTM A 672

1. SCOPE

This specification shall apply in addition to the applicable MESC Buying Descriptions and the referenced standards.

This specification is applicable to: - welded carbon steel pipe to ASTM A 672, Grade C65, Class 22; - welded alloy steel pipe to ASTM A 672, Grade L70, Class 22 (0.5 Mo).

2. REFERENCES

In this specification reference is made to the following publications: Note: Unless specifically designated by date the latest issue of each publication shall be used (together

with any amendments/supplements/revisions thereto).

ASTM A 672 Standard specification for electric-fusion-welded steel pipe for high-pressure service at moderate temperatures

ASTM A 516 Standard specification for pressure vessel plates, carbon steel, for moderate- and lower-temperature service

BS 5996 Specification for acceptance levels for internal imperfections in steel plate, strip and wide flats, based on ultrasonic testing

SPE 74/125 MESC Specification for hydrogen induced cracking sensitivity test

3. GENERAL REQUIREMENTS

3.1 MANUFACTURING

The longitudinal seam weld shall be made by the automatic submerged arc welding (SAW) process.

3.2 SUPPLEMENTARY REQUIREMENTS

The following ASTM A 672 supplementary requirements shall apply:

S3 Hardness test The hardness testing method shall be Vickers or Rockwell or another method which can make measurements within the heat affected zone. Hardness measurements shall be carried out after post weld heat treatment. No part of the weld, heat affected zone or base metal shall exceed 248 HV 10.

S13 Repair welding

3.3 MARKING

Marking shall include the nominal pipe size, the pipe schedule number or specified wall thickness in millimetres and the charge or heat number.

If die stamping is used, the stamps shall be low stress stamps (dot or round-bottomed).

Pipe specified as "SOUR" shall be marked with "SOUR" behind the ASTM designation.

If pipe is specified by wall thickness (instead of by schedule), then the wall thickness in millimetres shall be included in the marking.

3.3 CERTIFICATION

The specified inspection certificates shall be supplied to the purchaser unless the purchaser specifies that they shall be retained by the supplier.


4. SPECIFIC REQUIREMENTS

4.1 ASTM A 672, GRADE C65, CLASS 22

The carbon content shall be 0.23% maximum.

The carbon equivalent (CE) shall be 0.43 maximum and shall be determined by the following formula:

CE C Mn6

+ Cr + Mo + V 5

+ Ni + Cu15

= +

where the above values are in %.

Starting plate material shall be normalised.

4.2 ASTM A 672, GRADE C65, CLASS 22 SPECIFIED AS "SOUR"

Pipe shall be made from plate complying with ASTM A 516 as modified below. The plate shall be vacuum-treated, fully deoxidised, desulphurised and dephosphorised. The manufacturing/rolling process shall result in a homogeneous microstructure with no significant ferrite/pearlite banding. For plate with a sulphur content 0.001% and higher, calcium treatment shall be applied for inclusion shape control. The calcium content shall not exceed 3 times the sulphur content.

In order to ensure effective resistance to both hydrogen induced cracking (HIC) and sulphide stress corrosion (SSC), the chemical composition (product analysis) shall be restricted as follows, except where ASTM A 516 grade 65 is more restrictive:

Single Elements: Maximum wt.% Carbon (C) 0.20 Manganese (Mn) 1.30 Phosphorous (P) 0.01 Sulphur 0.002 Silicon (Si) 0.40 Copper (Cu) 0.40 Nickel (Ni) 0.40 Chromium (Cr) 0.30 Molybdenum (Mo) 0.12 Vanadium (V) 0.015 Niobium (Nb) 0.015 Titanium (Ti) 0.02 Boron (B) 0.0005 Combined Elements: Maximum wt.% Cr + Mo 0.30 Ni + Cu + Cr + Mo 0.70 V + Nb 0.02 Carbon Equivalent 0.43

Note: The micro-alloying elements Boron (B), Titanium (Ti), Niobium (Nb) and Vanadium (V) shall not be

intentionally added to the steel unless this has been given the prior approval of the purchaser.


Plate shall be ultrasonically checked for laminations in accordance with BS 5996-B4E2.

Plate material shall be HIC tested in accordance with SPE 74/125 after a simulation of the final heat treatment of the pipe.

The weld metal deposit shall not contain more than 1.00% nickel.


4.3 ASTM A 672, GRADE L70, CLASS 22

The carbon content shall be 0.20% maximum.

The aluminium content shall be 0.012% maximum.


1.SCOPE2.REFERENCES3.GENERAL REQUIREMENTS3.1MANUFACTURINGThe longitudinal seam weld shall be made by the automatic submerged arc welding (SAW) process.3.2SUPPLEMENTARY REQUIREMENTS3.3MARKING3.3CERTIFICATION

4.SPECIFIC REQUIREMENTS4.1ASTM A 672, GRADE C65, CLASS 224.2ASTM A 672, GRADE C65, CLASS 22 SPECIFIED AS "SOUR"4.3ASTM A 672, GRADE L70, CLASS 22

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SPE 74.003- ASTM 672