Vanforge provides a complete range of steel grades for all kinds of oil and gas operations.

API steel Grades

Vanforge provides all API steel grades including all the additional Supplementary

Requirements (SR) and/or Product Specification Levels (PSLs).

Proprietary steel Grades

We manufacture steel grades with performance properties that surpass those indicated by the API.

Grades with enhanced performance properties

Tenaris manufactures the following proprietary steel grades for superior mechanical properties:

• High collapse
• Deep well
• Low temperature
• High ductility
• Thermal service

Grades for corrosive environments

To improve the corrosion resistance for the demanding conditions of particular oil and

gas wells, Tenaris has developed a variety of proprietary steel grades that extend the life

span of pipe products reducing corrosion rates:

• Sour service
• High collapse & Sour service
• Critical service
• Corrosion Resistant Alloys

The following norms are used for our API 5CT casing and tubing:

ISO 31-0, Quantities and units — Part 0: General principles

ISO 643, Steels — Micrographic determination of the apparent grain size

ISO 6506-1, Metallic materials — Brinell hardness test — Part 1:Test method

ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1:Test method (Scales A, B, C, D, E, F, G, H, K, N, T)

ISO 6892, Metallic materials — Tensile testing at ambient temperature

ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring system

ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings

ISO 9303, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full peripheral ultrasonic testing for the detection of longitudinal imperfections

ISO 9304, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Eddy current testing for the detection of imperfections

ISO 9305, Seamless steel tubes for pressure purposes — Full peripheral ultrasonic testing for the detection of transverse imperfections

ISO 9402, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full peripheral magnetic transducer/flux leakage testing of ferromagnetic steel tubes for the detection of longitudinal imperfections

ISO 9598, Seamless steel tubes for pressure purposes — Full peripheral magnetic transducer/flux leakage testing of ferromagnetic steel tubes for the detection of transverse imperfections

ISO 9764, Electric resistance and induction welded steel tubes for pressure purposes — Ultrasonic testing of the weld seam for the detection of longitudinal imperfections

ISO/TR 9769, Steel and iron — Review of available methods of analysis

ISO 10400, Petroleum and natural gas industries — Formulae and calculation for casing, tubing, drill pipe and line pipe properties

ISO 11484, Steel tubes for pressure purposes — Qualification and certification of non-destructive testing (NDT) personnel

ISO 13665, Seamless and welded steel tubes for pressure purposes — Magnetic particle inspection of the tube body for the detection of surface imperfections

ISO 13678, Petroleum and natural gas industries — Evaluation and testing of thread compounds for use with casing, tubing and line pipe

ANSI-NACE TM0177:1996, Laboratory testing of metals for resistance to sulfide stress cracking at ambient temperature in H2S environment

API Bull 5C2, Bulletin on performance properties of casing, tubing and drill pipe

API Bull 5C3, Bulletin on formulas and calculations for casing, tubing, drill pipe and line pipe properties (plus Supplement 1)

API Spec 5B, Specification for threading, gauging and thread inspection of casing, tubing and line pipe threads

API Std 5T1, Imperfection terminology

ASNT SNT-TC-1A:1984, Recommended practice, personnel qualification and certification in non destructive testing

ASTM A370, Standard test methods and definitions for mechanical testing of steel products

ASTM A751, Standard test methods, practices and terminology for chemical analysis of steel products

ASTM A941, Terminology relating to steel, stainless steel, related alloys and ferroalloys

ASTM B117, Standard practice for operating salt spray (fog) apparatus

ASTM E4, Standard practices for force verification of testing machines

ASTM E10, Standard test method for Brinell hardness of metallic materials

ASTM E18, Standard test methods for Rockwell hardness and Rockwell superficial hardness of metallic materials

ASTM E23, Standard test methods for notched bar impact testing of metallic materials

ASTM E29, Standard practice for using significant digits in test data to determine conformance with specifications

ASTM E83, Standard practice for verification and classification of extensometer system

ASTM E112, Standard test methods for determining average grain size

ASTM E213, Standard practice for ultrasonic examination of metal pipe and tubing

ASTM E273, Standard practice for ultrasonic examination of the weld zone of welded pipe and tubing

ASTM E309, Standard practice for eddy-current examination of steel tubular products using magnetic saturation

ASTM E570, Standard practice for flux leakage examination of ferromagnetic steel tubular products

ASTM E709, Standard guide for magnetic particle examination

The following information to be supplied by the purchaser

Casing

1 When enquiring or placing orders for pipe to be manufactured in accordance with API 5CT, the purchaser shall specify the following:

Requirement

Standard

Quantity

Type of pipe or couplings

Casing:

Threaded or plain-end

Type of connection: round (short or long), buttress,

extreme-line threads, or other connection

Special clearance couplings

Liners:

Label 1 or specified outside diameter

Label 2 or specified mass or wall thickness

Grade and type where applicable

Range length

Seamless

Critical thickness for special end-finish couplings, stock or blanks

Critical thickness for special end-finish accessories

Wall thickness verification of special end-finish accessories

Delivery date and shipping instructions

Inspection by purchaser

2 The purchaser shall also state on the purchase agreement the requirements, where applicable, concerning the following stipulations, which are at the purchaser’s option:

Requirement

Heat treatment

Lower alternative impact test temperature

Casing jointers

Alternative drifting requirements

Casing with couplings detached

Coupling make-up (other than power-tight)

Coupling blanks

Seal ring couplings

Heat and supplementary analyses

Additional markings

Pipe coatings

Material certification

PSL 2 or 3

3 The following may be agreed between purchaser and manufacturer:

Requirement

Cold rotary straightening - Grade Q125

Statistical impact testing

Impact of Group 1 non-heat-treated pipe

Sulfide stress cracking test - Grades C90 and T95

Length of accessories

Thread and storage compound

Waiving NDE of Group 1 couplings in Grades H40, J55 and K55

Coupling thread plating - Grade Q125 only

Additional hardness testing - Grades M65 and L80

Additional hardness testing - Grades C90 and T95

Reduced section tensile specimens – Grade Q125

Hydrostatic pressure test for handling-tight make-up, accessories and Group 4 pup-joints

Alternative hydrostatic test pressures

Plain-end Grade Q125 casing hydrostatic testing

Non-destructive examination

Marking requirements

Thread protectors

Coupling blanks – Grade Q125 only

Upset casing – Grade Q125 only

Electric-weld casing – Grades P110 and Q125

Alternative F factor in SR 12 – Grade Q125

Special end-finish for casing, couplings, pup joints or accessories

Quality assurance requirements

Special size and wall thickness

Enhanced leak resistance LTC connections

Tubing

1 When enquiring or placing orders for pipe to be manufactured in accordance with this International Standard, the purchaser shall specify the following:

Requirement

Standard

Quantity

Type of pipe or couplings

Tubing:

Non-upset, external-upset or integral joint

Threaded, plain-end, or other connection

With or without couplings

Special bevel couplings

Special clearance couplings

Label 1 or specified outside diameter

Label 2 or specified mass or wall thickness

Grade and type, where applicable

Range length

Seamless

Critical thickness for special end-finish couplings, stock or blanks

Critical thickness for accessory material

Wall thickness verification of special end-finish accessories

Delivery date and shipping instructions

Inspection by purchaser

2 The purchaser shall also state on the purchase agreement the requirements, where applicable, concerning the following stipulations, which are at the purchaser’s option:

Requirement

Heat treatment

Upset length — Standard or extended

Rounded nose 8.12.4

Coupling make-up (other than power-tight)

Tubing with couplings detached

Seal ring couplings

Heat and supplementary analyses

Additional markings

Pipe coatings

Material certification

PSL 2 or 3

3 The following may be agreed between purchaser and manufacturer:

Requirement

Statistical impact testing

Impact testing of Group 1 pipe

Sulfide stress cracking test — Grades C90 and T95

Length of accessories

Thread and storage compound

Special end-finish for tubing, couplings or accessories

Waiving NDE of Group 1 couplings in Grades H40, J55 and K55

Additional hardness testing — Grades M65 and L80

Additional hardness testing — Grades C90 and T95

Hydrostatic pressure test for handling-tight make-up and pup joints

Alternative hydrostatic test pressures

Non-destructive examination

Marking requirements

Thread protectors

Electric-weld tubing — Grade P110

Special end-finish tubing, couplings, pup joints and accessories

Quality assurance requirements

Special size and wall thickness

Casing used for tubing

Process of manufacture

The various grades and groups of pipe furnished to this International Standard shall be made to a fine-grain practice. Steel made to a fine-grain practice contains one or more grain-refining elements, such as aluminium, niobium (columbium), vanadium or titanium in amounts intended to result in the steel having a fine austenitic grain size.

Process requiring validation

Final operations performed during pipe manufacturing that affect attribute compliance as required in API 5CT (except chemical composition and dimensions) shall have their processes validated.

Those processes requiring validation are:

• for seamless, as-rolled pipe: final reheating practice and hot sizing or stretch-reducing. If applicable, upsetting, cold finishing;
• for seamless, heat-treated pipe: heat treatment;

Grain size — Grades C90 and T95

Prior austenitic grain size shall be ASTM 5 or finer (determined in accordance with ISO 643 or ASTM E112).

Sulfide stress cracking test — Grades C90 and T95

Test and re-test requirements

For each heat, manufacturers shall demonstrate that the product meets or exceeds the minimum SSC threshold using one of the ANSI-NACE TM0177-96 test methods given below. If the purchaser requires an SSC threshold higher than the minimum, or requires a specific test method from the list below, agreement shall be reached between purchaser and manufacturer. For Methods A and D, sub-size or alternative specimens shall only be used following agreement with the purchaser. When Method D sub-size or alternative specimens are required, acceptance criteria shall be agreed between the purchaser and manufacturer.

Labels and sizes

In the dimensional tables in this International Standard, pipe is designated by labels and by size (outside diameter). The outside diameter size of external-upset pipe is the outside diameter of the body of the pipe, not the upset portion.

ISO/API casing list

Sizes, masses, wall thickness, grade and applicable end-finish

Chemical composition

a The carbon content for L80 may be increased up to 0,50 % maximum if the product is oil-quenched.

b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17,78 mm.

c The carbon content for C95 may be increased up to 0,55 % maximum if the product is oil-quenched.

d The molybdenum content for T95 Type 1 may be decreased to 0,15 % minimum if the wall thickness is less than 17,78 mm.

e For EW Grade P110, the phosphorus content shall be 0,020 % maximum and the sulfur content 0,010 % maximum.

NL = no limit. Elements shown shall be reported in product analysis.

Mechanical properties

a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.

b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.

NDE methods for seamless pipe, coupling stock

N = not required

R = required

A = one method or any combination of methods shall be used

B = at least one method shall be used in addition to ultrasonic inspection to inspect the outside surface

C = ultrasonic inspection shall be used to inspect the outside and inside surfaces

NA = not applicable

Supply scope of specifications

API 5CT PSL1 seamless tubing, without coupling

API 5CT PSL1 seamless tubing, with coupling

API 5CT PSL2 seamless tubing, without coupling

API 5CT PSL2 seamless tubing, with coupling

API 5CT PSL3 seamless tubing, without coupling

API 5CT PSL3 seamless tubing, with coupling

Production procedure