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High Strength Hot Rolled Pickled Steel S550MC / S600MC / S650MC / S700MC

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What’s Hot Rolled Pickled Steel?

Hot Rolled Pickled & Oiled Steel (abbreviated as HRPO, also called hot rolled pickled steel) is hot-rolled steel strip/sheet that undergoes an extra acid pickling process after hot rolling.

Production Process

Hot rolling: Cast slab is heated and rolled into target thickness at high temperature; a thick layer of iron oxide scale (mill scale) forms on the surface.

Pickling: Immerse the hot rolled coil in hydrochloric acid solution to fully dissolve and remove all black oxide scale.

Rinsing & anti-rust oil coating: Clean residual acid on the surface, then coat uniform anti-rust oil to prevent rust during storage and transportation.

High Strength Hot Rolled Pickled Steel S550MC / S600MC / S650MC / S700MC

Product Overview

Hot Rolled Pickled High-Strength Structural Steel S550MC, S600MC, S650MC and S700MC. This series of steel conforms to EN 10149-2. It is high-strength hot rolled steel produced via thermomechanical rolling, specially designed for cold forming. The regular supply form is hot rolled pickled and oiled (HRPO) coils or sheets. The numerical value in each grade denotes the minimum upper yield strength of the steel, while "MC" represents the thermomechanical rolling process, making the steel suitable for complex cold stamping and forming operations.

Chemical Composition (Heat Analysis) (%)

Grade	C	Si	Mn	P	S	Al	Nb	V	Ti	Mo
S550MC	≤0.10	≤0.15	≤1.70	≤0.025	≤0.010	≤0.015	≤0.09	≤0.20	≤0.15
S600MC	≤0.10	≤0.15	≤1.80	≤0.025	≤0.010	≤0.015	≤0.09	≤0.20	≤0.15
S650MC	≤0.10	≤0.15	≤2.00	≤0.025	≤0.010	≤0.015	≤0.09	≤0.20	≤0.15
S700MC	≤0.10	≤0.15	≤2.10	≥0.025	≤0.010	≤0.015	≤0.09	≤0.20	≤0.15	≤0.50

Note: Nb+V+Ti≤0.22%

Mechanical Properties

Grade	ReH,MPa	Rm,MPa	A,%		180° Bending test diameter
Grade	ReH,MPa	Rm,MPa	a<3mm, L₀=80mm	a≥3mm, L₀=5.65√S₀ mm	180° Bending test diameter
S550MC	≥550	600~760	≥12	≥14	1.5a
S600MC	≥600	650~820	≥11	≥13	1.5a
S650MC	≥650	700~880	≥10	≥12	2.0a
S700MC	≥700	750~950	≥10	≥12	2.0a

Note:Longitudinal samples are taken for tensile test, horizontal samples are taken for cold bending test

S550MC vs S600MC vs S650MC vs S700MC

S550MC, S600MC, S650MC and S700MC belong to the same family of high yield strength steels for cold forming. The main difference is their specified strength level, which affects material selection for structural loading, weight reduction and forming operations.

Steel Grade	Minimum Yield Strength*	Material Selection
S550MC	550 MPa	High-strength stamped brackets and structural supports
S600MC	600 MPa	Structural parts requiring increased yield strength
S650MC	650 MPa	Chassis components, cross members and reinforced structures
S700MC	700 MPa	High-load structural parts and weight-optimized designs

*Minimum yield strength values are nominal grade designations; applicable values depend on material thickness and the relevant standard.

Which Steel Grade Should You Choose?

S550MC and S600MC are suitable starting points for components requiring higher strength than conventional structural steels while maintaining practical cold-forming characteristics.

S650MC is appropriate for demanding structural applications where increased yield strength is required, including selected commercial vehicle chassis components.

S700MC offers a higher strength level for weight-sensitive structural designs. Forming radius, edge quality, welding procedures and material thickness must be considered during component development.

The highest-strength grade is not automatically the best choice. Material selection should be based on component loads, forming geometry, fabrication methods and the specified mechanical properties.

Automotive Applications of High Strength Hot Rolled Pickled Steel

High strength hot rolled pickled steel is used in automotive components that require structural strength, dimensional consistency and reliable forming performance.

Automotive Chassis and Cross Members

S550MC–S700MC steel grades provide material options for automotive chassis brackets, frame reinforcements and cross members.

Their high yield strength supports the design of structural components under significant mechanical loading, particularly in commercial vehicles and heavy-duty transportation applications.

Automotive Seat Structures

Selected high-strength grades can be used for seat support brackets, structural reinforcements and other stamped seat components.

Material selection depends on the required thickness, forming geometry, joint design and load-bearing performance.

Structural Brackets and Reinforcements

These pickled and oiled steel steels are suitable for formed and welded brackets used in automotive and transportation assemblies.

The pickled surface provides a cleaner starting condition for cutting and fabrication compared with unpickled hot rolled material.

Commercial Vehicle Components

High-strength thermomechanically rolled steel is also used in truck frames, cross members, support structures and fabricated parts requiring improved strength-to-weight performance.

S650MC and S700MC are particularly relevant to structural designs where reducing component weight is an important engineering objective.

Hot Rolled Pickled Steel vs Regular Hot Rolled Steel

Both materials originate from the hot rolling process, but pickled steel undergoes an additional surface treatment to remove mill scale.

Property	Hot Rolled Pickled Steel	Regular Hot Rolled Steel
Surface Condition	Mill scale removed	Mill scale generally remains
Surface Appearance	Cleaner, more uniform	Dark oxide surface
Further Processing	Suitable for stamping, cutting and fabrication	Surface cleaning may be required
Corrosion Protection	Temporary protection from anti-rust oil when oiled	Depends on storage and surface treatment
Typical Supply Forms	Coil, sheet, slit strip	Coil, sheet, plate

Pickling improves surface cleanliness but does not increase the base steel's mechanical strength or provide permanent corrosion protection.

For automotive parts requiring a clean surface before forming, welding or additional finishing, pickled and oiled steel offers a practical material option.

Custom Sizes and Processing for Hot Rolled Pickled Steel

Solucky Steel supplies S550MC, S600MC, S650MC and S700MC steel in coil and sheet forms, with processing options for automotive and structural component manufacturers.

Available services include:

● Coil Slitting: Processing coils into narrower strips for stamping and fabrication.

● Cut-to-Length: Preparing flat sheets according to specified length requirements.

● Flatness Leveling: Improving sheet flatness for downstream cutting and forming operations.

● Custom Material Preparation: Reviewing thickness, width, grade and surface requirements for individual orders.

Specific processing availability depends on the selected grade, material thickness and order requirements.

Request a Quote for S550MC–S700MC Steel

Size & Supply Range

--Thickness: 2.0 mm ~ 14.0 mm

--Width: 800 mm ~ 1650 mm

--Coil inner diameter: 508 mm / 610 mm

--Coil weight: 8 ~ 28 tons per coil

--Surface condition: Pickled & anti-rust oiled

--Custom slitting, cutting and flatness leveling services are available according to customer drawings and technical requirements.

Hot Rolled Pickled steel Coils/Plates－ Buyer’s FAQs

What’s the minimum order quantity for Hot Rolled Pickled steel coils/sheets?

We accept 200-500KG quantity.

Can you provide custom size cutting and slitting?

Yes, we supply custom slitting, cutting and flatness leveling services are available according to customer drawings and technical requirements.

Does HRPO hot rolled pickled steel have Lüders lines after stamping?

No, HRPO S550MC/S600MC/S650MC/S700MC steel has no room-temperature aging and no obvious yield extension, so no Lüders lines will appear during stamping even after long-term storage.

How can acid-washed & oil-coated steel be stored without getting rusty?

Store HRPO pickled & oiled steel in dry, ventilated indoor warehouse, avoid rain, dew and humid air. Keep coils/sheets off ground with wooden pallets, separate different layers with moisture-proof paper. Avoid long-term exposure outdoors.

What’s the difference between MC steel and DP dual phase steel?

MC steel (S550MC/S600MC/S650MC/S700MC): Thermomechanically hot rolled steel, microstructure of fine ferrite + pearlite, no martensite.

DP dual phase steel: Mainly cold rolled steel, soft ferrite matrix with scattered hard martensite islands.

What certificates can you provide before shipment?

We can supply official Mill Test Certificate (MTC) with full mechanical & chemical data.Third-party inspection reports are available upon your request before shipment.