Sanmac 4571 (Bar)

Chemical composition (nominal) %

Mechanical properties

Bar steel is tested in delivery condition.

At 20°C (68°F)

1 MPa = 1 N/mm²
a)R_p0.2 and R_p1.0 correspond to 0.2% offset and 1.0% offset yield strength respectively.
b) Based on L₀ = 5.65 ÖS₀ where L₀ is the original gauge length and S₀ the original cross-section area.

Impact strength

Due to its austenitic microstructure, Sandvik SANMAC 4571 has very good impact strength both at room temperature and at cryogenic temperatures.
Tests have demonstrated that the steel fulfils the requirements (60 J (44 ft-lb) at -196 ^oC (-320^oF)) according to the European standards prEN13445-2(UFPV-2) and EN 10272.

At high temperatures

Machining

SANMAC stands for Sandvik Machinability Concept. In SANMAC materials, machinability has been improved without jeopardising properties such as corrosion resistance and mechanical strength.

The improved machinability is owing to:

• Optimised non-metallic inclusions
• Optimal chemical composition
• Optimised process and production parameters

Detailed recommendations for the choice of tools and cutting data regarding turning, thread cutting, parting/grooving, drilling, milling and sawing are provided in the brochure S-02909-ENG.

The diagram shows the ranges within which data should be chosen in order to obtain a tool life of minimum 10 minutes when machining SANMAC 4571.

Figure 1. Machining chart Sandvik SANMAC 4571.

The ranges are limited in the event of low feeds because of unacceptable chip breaking. In the case of high cutting speeds, plastic deformation is the most dominant cause of failure. When feed increases and the cutting speed falls, edge frittering (chipping) increases significantly. The diagram is applicable for short cutting times. For long, continuous cuts, the cutting speeds should be reduced somewhat.

The lowest recommended cutting speed is determined by the tendency of the material to stick to the insert (built-up-edge), although the integrity of insert clamping and the stability of the machine are also of great significance.

It is important to conclude which wear mechanism is active, in order to optimise cutting data with the aid of the diagram.

The lowest recommended cutting speed is determined by the tendency of the material to stick to the insert (built-up-edge), although the integrity of insert clamping and the stability of the machine are also of great significance.

It is important to conclude which wear mechanism is active, in order to optimise cutting data with the aid of the diagram.

Turning of Sandvik SANMAC 4571

Recommended insert and cutting data (starting values for a tool-life of 15 minutes)

Drilling of Sandvik Sanmac

The recommended methods for drilling give the most cost effective results for the respective diameter ranges. When producing holes with diameters larger than 58 mm, short-hole drilling is used up to 58 mm, followed by internal turning up to the desired diameter. Cutting data for internal turning should be chosen in accordance with the turning recommendations. The recommendations for drilling are applicable for a tool-life of 30 minutes.

Drilling with Sandvik Coromant Delta C drill, diameter 3 - 12.7 mm

Code R415.5. Grade GC1220
(diameter range 3 - 20 mm)

* The lower value should be selected for smaller diameters

Short hole drilling, diameter 12.7-58 mm

Coromant U-drill, R416.2

* Sandvik Coromant inserts
** GC1120 for diameters below 17.5 mm

Drilling with high speed steel (HSS) drills

(diamter 1-3 mm)

* The lower feed value should be selected for smaller diameters
** The higher cutting speed should be selected for coated drills