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S.p.A. SOCIETÀ ITALIANA COMMERCIO ACCIAI E METALLI Head office and warehouse in Parona Lomellina

SEAMLESS TUBES FOR MECHANICAL APPLICATIONS GENERAL FEATURES GENERAL DESCRIPTION The tubes for mechanical applications are suitable for machining by turning or CNC equipments. The wide size range available, with O.D. from 21.3 to 812 mm, gives the possibility to manufacture several kinds of components for different applications: small machine parts, flanges, fittings, Archimedean screws, hydraulic cylinders for heavy machines etc. STRUCTURAL PURPOSES The compliance to the norm EN 10210-1/2 allows the product application for structural purposes as well. This norm is harmonized according to the...

STEELS TABLE CHEMICAL/PHYSICAL FEATURES The tables on the following pages describe the chemical and mechanical limits fixed by the norm for the steelgrades that are mainly employed for mechanical applications. The various steelgrades differ one another from their chemical composition and mechanical properties, these parameters determine also the different possibilities of application for each steelgrade. NON-ALLOY QUALITY STEELS: Standard steels with low carbon content. CHEMICAL ANALYSIS FOR NON-ALLOY QUALITY STEELS Steel grade CHEMICAL ELEMENTS (% on mass) Si Mn Min. Max. Min. Max. – 0.35 –...

STEELS TABLE NON-ALLOY STEELS WITH SPECIFIED IMPACT PROPERTIES Standard steels with low carbon content and low temperature impact properties. CHEMICAL ANALYSIS FOR NON-ALLOY STEELS WITH SPECIFIED IMPACT PROPERTIES Steel grade CHEMICAL ELEMENTS (% on mass) C Al/N ≥ 2; Nb + Ti + V ≤ 0.12%; Cr + Cu + Mo ≤ 0.45 %. ² Nb + V ≤ 0.20 % MECHANICAL PROPERTIES FOR NON-ALLOY STEELS WITH SPECIFIED IMPACT PROPERTIES from 490 from 490 from 490 from 450 to 650 to 630 to 630 to 590 from 490 from 490 from 490 from 450 to 650 to 630 to 630 to 590 Steel grade Delivery condition Longitudinal impact propertiesat -40°C...

NON-ALLOY SPECIAL STEELS: Steels with high carbon content. CHEMICAL ANALYSIS FOR NON-ALLOY SPECIAL STEELS Steel grade CHEMICAL ELEMENTS (% on mass) C Steel grade Delivery condition MECHANICAL PROPERTIES FOR NON-ALLOY SPECIAL STEELS Longitudinal impact value Temp. (°C) Impact test is foreseen only for quenched and tempered material (+QT)

STEELS TABLE ALLOY SPECIAL STEELS: Steels with a complex chemical composition that helps achieving high mechanical properties. CHEMICAL ANALYSIS FOR ALLOY SPECIAL STEELS Steelgrade 41Cr4 25CrMo4 30CrMo4 34CrMo4 42CrMo4 36CrNiMo4 30CrNiMo8 41NiCrMo7-3-2¹ ¹Cu ≤ 0.25%

Longitudinal impact value W.T. (mm) Longitudinal elongation min. % Temp. (°C) Delivery condition MECHANICAL PROPERTIES FOR ALLOY SPECIAL STEELS Yield strength min. (ReH) Tensile strength min. (Rm) (N/mm²=Mpa) (N/mm²=Mpa) Steel For nominal w.t. in mm grade > 8 > 20 > 50 > 8 > 20 > 50 ≤8 ≤8 ≤ 20 ≤ 50 ≤ 80 ≤ 20 ≤ 50 ≤ 80

STEELS TABLE STEELS ACCORDING TO MANUFACTURERS' SPECIFICATIONS:

Delivery condition Long. impact values (J min.) ^ Temperature °C -20 -30 -40 -50 -60 *This steelgrade is usually supplied as rolled followed by heat treatment. The mechanical properties stated here are only approximate. ^ The impact values can vary according to

STEELS COMPARISON TABLE This table contains steelgrades which are known but no longer up to date or are present only in manufacturers' specifications. For each of them, an alternative steelgrade, among the ones codified by EN 10297-1, with similar features is suggested. EN 10297-1 Delivery condition AFNOR Norm Special steels* Normalized (+N) Quenched and tempered (+QT) Annealed (+A) +TH¹ +FP² Normalized (+N) *Steels according to manufacturers' specifications, not foreseen by any norm. ¹ Heat treatment required to achieve a hardness value within a specified range. ² Heat treatment required to...

OUTSIDE DIAMETER ± 1% on the nominal size, with a minimum ± 0.5 mm. STRAIGHTNESS For OD ≥ 33.7 mm, the maximum allowed deviation on straightness (in mm) corresponds to 1.5‰ on the total tube length. Note: the norm EN 10297-1 does not state any tolerance on ovality, eccentricity or inner diameter: these parameters are settled by what stated on OD and w.

HOT ROLLED SEAMLESS CYLINDER TUBES (BORED AND HONED) GENERAL DESCRIPTION When the required size for a cylinder product can not be offered as cold drawn tubes it can be obtained machining hot rolled tubes with specific quality features. In order to reach the inside diameter tolerance H8 according to ISO 286-2, the tube must bored as first, removing most part of the material in excess, then honed reaching the definitive size and the intended surface condition. The mechanical and chemical properties of the tubes don’t change after machining. STEEL GRADES The inside bored and honed tubes are available...

O.D., w.t. and outside straightness follow the tolerances stated by the norm EN 10297-1. The tolerances on the I.D. are ruled by tolerance H8 according to EN 20286 instead, as resumed here below.

Note: the present table reports only the most common sizes; on request it is possible to supply other sizes and tolerances as well.

STOCK FACILITY STEEL GRADES Our standard stock of mechanical tubes consists of the following steel grades E355/S355J2H/P355N, E355K2/ P355NL1/P355NL2, E470, E420J2, E460K2 and E590K2. It is possible to supply material in all existing steel grades stated in this catalogue, upon request and with a minimum quantity according to mill conditions. All the standard sizes according to the norm and stated in the table “Sizes, tolerances and masses” are to be considered as normal stock supply. It is possible to supply also special sizes upon request and with a minimum quantity to be agreed. Mill test certificates...