Marzouk Steel is a top-notch steel manufacturer and exporter with headquarters in Tunis, Tunisia. With an expertise in a variety of steel solutions, the organization is well-known for its capabilities to manufacture and supply superior-quality J525 tubing. This cold-drawn, seamless carbon steel tubing is engineered to meet high-performance applications, such as automotive, hydraulic, and other industrial applications. Marzouk Steel provides the ultimate level of accuracy, strength, and reliability in all its products, thus emerging as a trusted business partner for organizations that want reliable and high-performance tubing products in the Tunisia and globally.
J525 tubing is made mainly of carbon steel, with the chemical composition of carbon (0.18% max), manganese (0.60-0.90%), phosphorus (0.035% max), sulfur (0.035% max), and iron as base material. Mechanical properties of J525 tubing consist of tensile strength between 45,000 and 60,000 psi (310-414 MPa) and a yield strength of about 30,000 psi (207 MPa). It also has very good cold working properties, high strength, and pressure resistance, which makes it a good material for hydraulic, automotive, and other demanding industrial uses.
| Grade: | ASME/ASTM SA179, SA192, SA210, SA178, SA214, API 5L |
|---|---|
| Size: | 1/8” NB TO 24” NB Sch 40/80/160/XXS |
| Form | Round, Square, Rectangular, Coil, U Tube, |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Bevelled End |
| Type | Seamless / ERW / Welded |
| Certification For Carbon | Mill Test Certificate as per EN 10204 / 3.2B |
| General Requirements | ASTM A 530/A 530M |
| Dimensional Tolerances | ANSI B 36.10 |
| OD Range | 1.250″ – 6.000″ (30-150mm) |
| Wall Range | 0.095″ – 1.000″ (.2.5-25mm) |
| Carbon | 0.06 – 0.18 Max |
| Manganese | 0.30 – 0.60 |
| Phosphorus | .040 Max |
| Sulfur | 0.050 Max |
| Yield Strength, min | 170 MPa |
| Ultimate Strength, min | 310 MPa |
| Elongation in 50 mm, min | 35% |
| Hardness (Rockwell B), max | 65 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
| TUBING WALL THICKNESS TOLERANCES | |||
|---|---|---|---|
| Nominal Wall Thickness (Inches) | Nominal Tube OD Through 1” (+/- Inches) | Nominal Tube OD Over 1” Through 2” (+/- Inches) | Nominal Tube OD Over 2” Through 4” (+/- Inches) |
| .028 (22 Ga) | .002/.003 | .003/.003 | .003/.003 |
| .035 (20 Ga) | .002/.004 | .002/.004 | .002/.004 |
| .042 (19 Ga) | .002/.004 | .002/.004 | .002/.005 |
| .049 (18 Ga) | .004/.005 | .003/.005 | .004/.008 |
| .058 (17 Ga) | .006/.006 | .004/.008 | .004/.008 |
| .065 (16 Ga) | .006/.006 | .004/.008 | .004/.008 |
| .072 (15 Ga) | .006/.010 | .006/.010 | .006/.010 |
| .083 (14 Ga) | .006/.010 | .006/.010 | .006/.010 |
| .095 (13 Ga) | .006/.010 | .006/.010 | .006/.010 |
| .100 | .006/.010 | .006/.010 | .006/.010 |
| .109 (12 Ga) | .006/.010 | .006/.010 | .006/.010 |
| .118 | .006/.010 | .006/.010 | .006/.010 |
| .120 (11 Ga) | .006/.010 | .006/.010 | .006/.010 |
| .134 (10 Ga) | .006/.010 | .006/.010 | .006/.010 |
| .148 (9 Ga) | — | .007/.001 | .007/.011 |
| .156 (5/32) | — | .007/.011 | .007/.011 |
| .165 (8 Ga) | — | .007/.011 | .007/.011 |
| .180 (7 Ga) | — | .007/.011 | .007/.011 |
| .197 | — | .008/0.12 | .008/0.12 |
| .203 (6 Ga) | — | .008/0.12 | .008/0.12 |
| .219 (7/32) | — | .008/.012 | .008/.012 |
| .236 | — | .014/.018 | .014/.018 |
| .238 (4 Ga) | — | .014/.018 | .014/.018 |
| .259 (3 Ga) | — | .014/.020 | .014/.020 |
J525 tubing is used in most high-strength, long-life tubing applications in the most demanding industries. Its most common uses include hydraulic systems, automotive fuel line, brake line, and air conditioning systems. The seamless cold-drawn construction of the tubing qualifies it to be used in high-pressure situations, and it is most applicable in situations where performance and dependability are key. J525 tubing is also widely employed in fluid and gas transfer, construction equipment, equipment manufacturing, oil & gas operations. J525 tubing, because of its ability to withstand wear, corrosion, and deformation, is used for a variety of engineering and industrial applications.
Marzouk Steel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Tunis, Tunisia.
Copyright 2025 Marzouk Steel. All rights reserved
