Guide to GMW Automotive Steel Grades

General Motors (GM) automotive steel specifications cover a wide range of materials used in vehicle body manufacturing, stamping, structural components and safety-related applications. These specifications include conventional cold rolled steel, galvanized steel, electrogalvanized steel, bake-hardening steel, interstitial-free steel, low-alloy high-strength steel and advanced high-strength steel.

Solucky supplies various automotive steel grades listed under GMW2M, GMW3032M and GMW3399M specifications. The available designations cover different steel strength levels, coating configurations, forming characteristics and manufacturing requirements.

This guide organizes the supplied GM steel grades by specification and material category, helping automotive manufacturers, steel service centers and purchasing teams identify suitable material designations.

1. GMW2M Automotive Steel Grades

GMW2M includes conventional cold rolled steel grades, including CR1, CR2, CR3, CR4 and CR5. These grades are available in different coating configurations, including hot-dip galvanized, electrogalvanized and uncoated options.

1.1 Hot-Dip Galvanized Cold Rolled Steel (HD)

The following CR grades are available with different HD coating designations.

HD40G40G Coating

• GMW2M-ST-S-CR1-HD40G40G-U

• GMW2M-ST-S-CR2-HD40G40G-U

• GMW2M-ST-S-CR3-HD40G40G-U

• GMW2M-ST-S-CR4-HD40G40G-U

• GMW2M-ST-S-CR5-HD40G40G-U

HD50G50G Coating

• GMW2M-ST-S-CR1-HD50G50G-U

• GMW2M-ST-S-CR2-HD50G50G-U

• GMW2M-ST-S-CR3-HD50G50G-U

• GMW2M-ST-S-CR4-HD50G50G-U

• GMW2M-ST-S-CR5-HD50G50G-U

HD60G60G Coating

• GMW2M-ST-S-CR1-HD60G60G-U

• GMW2M-ST-S-CR2-HD60G60G-U

• GMW2M-ST-S-CR3-HD60G60G-U

• GMW2M-ST-S-CR4-HD60G60G-U

• GMW2M-ST-S-CR5-HD60G60G-U

HD70G70G Coating

• GMW2M-ST-S-CR1-HD70G70G-U

• GMW2M-ST-S-CR2-HD70G70G-U

• GMW2M-ST-S-CR3-HD70G70G-U

• GMW2M-ST-S-CR4-HD70G70G-U

• GMW2M-ST-S-CR5-HD70G70G-U

HD90G90G Coating

• GMW2M-ST-S-CR1-HD90G90G-U

• GMW2M-ST-S-CR2-HD90G90G-U

• GMW2M-ST-S-CR3-HD90G90G-U

• GMW2M-ST-S-CR4-HD90G90G-U

• GMW2M-ST-S-CR5-HD90G90G-U

1.2 Uncoated Cold Rolled Steel

The following GMW2M designations are listed without a coating designation:

• GMW2M-ST-S CR1 UNCOATED

• GMW2M-ST-S CR2 UNCOATED

• GMW2M-ST-S CR3 UNCOATED

• GMW2M-ST-S CR4 UNCOATED

• GMW2M-ST-S CR5 UNCOATED

1.3 Electrogalvanized Steel (EG)

Electrogalvanized steel is available in different coating configurations, including products associated with GMW11M.

GMW11M EG50G50GE Coating

• GMW2M-ST-S CR1 GMW11M EG50G50GE

• GMW2M-ST-S CR2 GMW11M EG50G50GE

• GMW2M-ST-S CR3 GMW11M EG50G50GE

• GMW2M-ST-S CR4 GMW11M EG50G50GE

• GMW2M-ST-S CR5 GMW11M EG50G50GE

GMW11M EG60G60GE Coating

• GMW2M-ST-S CR1 GMW11M EG60G60GE

• GMW2M-ST-S CR2 GMW11M EG60G60GE

• GMW2M-ST-S CR3 GMW11M EG60G60GE

• GMW2M-ST-S CR4 GMW11M EG60G60GE

• GMW2M-ST-S CR5 GMW11M EG60G60GE

EG50G50GE Coating

• GMW2M-ST-S CR1 EG50G50GE

• GMW2M-ST-S CR2 EG50G50GE

• GMW2M-ST-S CR3 EG50G50GE

• GMW2M-ST-S CR4 EG50G50GE

• GMW2M-ST-S CR5 EG50G50GE

EG60G60GE Coating

• GMW2M-ST-S CR1 EG60G60GE

• GMW2M-ST-S CR2 EG60G60GE

• GMW2M-ST-S CR3 EG60G60GE

• GMW2M-ST-S CR4 EG60G60GE

• GMW2M-ST-S CR5 EG60G60GE

1.4 Hot Rolled Steel

The following hot rolled grade is also included:

• GMW2M-ST-S-CR?

Note: The supplied GMW2M list contains the designation GMW2M-ST-S-CR1 through CR5 and HR2 appears in other manufacturer-specific lists, but no complete GMW2M HR2 designation was provided. Confirm the exact designation before adding an HR2 product.

2. GMW3032M Automotive Steel Grades

GMW3032M covers different automotive steel categories, including low-alloy high-strength steel, bake-hardening steel, interstitial-free steel, phosphorus-alloyed steel and other cold rolled and hot rolled materials.

2.1 Conventional and Specialty Cold Rolled Steel

The supplied list includes the following designations:

• GMW3032M-ST-S-210P-HD60G60G-U

• GMW3032M-ST-S-210P-HD50G50G-U

• GMW3032M-ST-S-CR180B2-HD60G60G-U

• GMW3032M-ST-S-CR180B2-HD50G50G-U

• GMW3032M-ST-S-CR180B2-UNCOATED-U

• GMW3032M-ST-S-CR210B2-HD60G60G-U

• GMW3032M-ST-S-CR210B2-HD70G70G-U

• GMW3032M-ST-S-CR210B2-HD50G50G-U

• GMW3032M-ST-S-CR210B2-UNCOATED-U

• GMW3032M-ST-S-CR270B2-HD60G60G-U

• GMW3032M-ST-S-CR270B2-HD70G70G-U

• GMW3032M-ST-S-CR250B2-HD50G50G-U

• GMW3032M-ST-S-CR300B2-HD70G70G-U

• GMW3032M-ST-S-CR300B2-HD50G50G-U

• GMW3032M-ST-S-CR250B2-UNCOATED-U

2.2 Interstitial-Free Steel (IF)

Interstitial-free steel is used in automotive stamping applications requiring excellent ductility and deep-drawing performance.

HD60G60G Coating

• GMW3032M-ST-S-CR180IF-HD60G60G-U

• cGMW3032M-ST-S-CR240IF-HD60G60G-U

HD70G70G Coating

• GMW3032M-ST-S-CR180IF-HD70G70G-U

• GMW3032M-ST-S-CR210IF-HD70G70G-U

• GMW3032M-ST-S-CR240IF-HD70G70G-U

HD50G50G Coating

• GMW3032M-ST-S-CR180IF-HD50G50G-U

• GMW3032M-ST-S-CR210IF-HD50G50G-U

• GMW3032M-ST-S-CR240IF-HD50G50G-U

Uncoated

• GMW3032M-ST-S-CR180IF-UNCOATED-U

• GMW3032M-ST-S-CR210IF-UNCOATED-U

• GMW3032M-ST-S-CR240IF-HUNCOATED-U

2.3 Low-Alloy High-Strength Steel (LA)

LA steel offers different strength levels for automotive components requiring a balance between strength and formability.

Cold Rolled LA Steel – HD60G60G Coating

• GMW3032M-ST-S-270LA-HD60G60G-U

• GMW3032M-ST-S-CR270LA-HD60G60G-U

• GMW3032M-ST-S-CR300LA-HD60G60G-U

• GMW3032M-ST-S-CR340LA-HD60G60G-U

• GMW3032M-ST-S-CR380LA-HD60G60G-U

• GMW3032M-ST-S-CR420LA-HD60G60G-U

• GMW3032M-ST-S-CR240LA-HD60G60G-U

Cold Rolled LA Steel – HD70G70G Coating

• GMW3032M-ST-S-CR270LA-HD70G70G-U

• GMW3032M-ST-S-CR300LA-HD70G70G-U

• GMW3032M-ST-S-CR340LA-HD70G70G-U

• GMW3032M-ST-S-CR380LA-HD70G70G-U

• GMW3032M-ST-S-CR420LA-HD70G70G-U

• GMW3032M-ST-S-CR500LA-HD70G70G-U

• GMW3032M-ST-S-CR550LA-HD70G70G-U

• GMW3032M-ST-S-CR650LA-HD70G70G-U

• GMW3032M-ST-S-CR240LA-HD70G70G-U

Cold Rolled LA Steel – HD50G50G Coating

• GMW3032M-ST-S-250LA-HD50G50G-U

• GMW3032M-ST-S-CR250LA-HD50G50G-U

• GMW3032M-ST-S-CR240LA-HD50G50G-U

• GMW3032M-ST-S-CR300LA-HD50G50G-U

• GMW3032M-ST-S-CR340LA-HD50G50G-U

• GMW3032M-ST-S-CR380LA-HD50G50G-U

• GMW3032M-ST-S-CR420LA-HD50G50G-U

Cold Rolled LA Steel – Uncoated

• GMW3032M-ST-S-CR250LA-UNCOATED-U

• GMW3032M-ST-S-CR240LA-UNCOATED-U

• GMW3032M-ST-S-CR300LA-UNCOATED-U

• GMW3032M-ST-S-CR340LA-UNCOATED-U

• GMW3032M-ST-S-CR380LA-UNCOATED-U

• GMW3032M-ST-S-CR420LA-UNCOATED-U

Hot Rolled LA Steel

HD60G60G:

• GMW3032M-ST-S-HR340LA-HD60G60G-U

• GMW3032M-ST-S-HR420LA-HD60G60G-U

• GMW3032M-ST-S-HR550LA-HD60G60G-U

HD70G70G:

• GMW3032M-ST-S-HR340LA-HD70G70G-U

• GMW3032M-ST-S-HR420LA-HD70G70G-U

• GMW3032M-ST-S-HR550LA-HD70G70G-U

HD50G50G:

• GMW3032M-ST-S-HR340LA-HD50G50G-U

• GMW3032M-ST-S-HR420LA-HD50G50G-U

• GMW3032M-ST-S-HR550LA-HD50G50G-U

Uncoated:

• GMW3032M-ST-S-HR340LA-UNCOATED-U

• GMW3032M-ST-S-HR420LA-UNCOATED-U

• GMW3032M-ST-S-HR550LA-UNCOATED-U

• GMW3032M-ST-S-HR650LA-UNCOATED-U

2.4 Microalloyed Steel (MC)

Microalloyed steel is used in automotive structural components requiring improved strength and mechanical performance.

The supplied list includes:

• GMW3032M-ST-S-HR340LA-HD60G60G-U

• GMW3032M-ST-S-HR300MC-HD60G60G-U

• GMW3032M-ST-S-HR340MC-HD60G60G-U

• GMW3032M-ST-S-HR420MC-HD60G60G-U

• GMW3032M-ST-S-HR460MC-HD60G60G-U

• GMW3032M-ST-S-HR500MC-HD60G60G-U

• GMW3032M-ST-S-HR300MC-HD70G70G-U

• GMW3032M-ST-S-HR340MC-HD70G70G-U

• GMW3032M-ST-S-HR380MC-HD70G70G-U

• GMW3032M-ST-S-HR420MC-HD70G70G-U

• GMW3032M-ST-S-HR460MC-HD70G70G-U

• GMW3032M-ST-S-HR500MC-HD70G70G-U

2.5 Phosphorus-Alloyed Steel (P)

The P-series designations are available in different coating configurations:

HD60G60G

• GMW3032M-ST-S-CR180P-HD60G60G-U

• GMW3032M-ST-S-CR240P-HD60G60G-U

• GMW3032M-ST-S-CR270P-HD60G60G-U

HD70G70G

• GMW3032M-ST-S-CR180P-HD70G70G-U

• GMW3032M-ST-S-CR240P-HD70G70G-U

• GMW3032M-ST-S-CR270P-HD70G70G-U

2.6 GMW3032M Uncoated Steel

Additional uncoated designations include:

• GMW3032M-ST-S-CR180B2-UNCOATED-U

• GMW3032M-ST-S-210P-UNCOATED-U

• GMW3032M-ST-S-CR180IF-UNCOATED-U

• GMW3032M-ST-S-CR210IF-UNCOATED-U

• GMW3032M-ST-S-CR240IF-HUNCOATED-U

• GMW3032M-ST-S-CR180B2-UNCOATED-U

• GMW3032M-ST-S-CR210B2-UNCOATED-U

• GMW3032M-ST-S-CR250B2-UNCOATED-U

• GMW3032M-ST-S-CR300B2-UNCOATED-U

• GMW3032M-ST-S-CR250LA-UNCOATED-U

• GMW3032M-ST-S-CR240LA-UNCOATED-U

• GMW3032M-ST-S-CR300LA-UNCOATED-U

• GMW3032M-ST-S-HR340LA-UNCOATED-U

• GMW3032M-ST-S-CR340LA-UNCOATED-U

• GMW3032M-ST-S-CR380LA-UNCOATED-U

• GMW3032M-ST-S-CR420LA-UNCOATED-U

• GMW3032M-ST-S-HR420LA-UNCOATED-U

• GMW3032M-ST-S-HR550LA-UNCOATED-U

• GMW3032M-ST-S-HR650LA-UNCOATED-U

3. GMW3399M Advanced High-Strength Automotive Steel Grades

GMW3399M covers advanced high-strength automotive steel grades, including dual-phase steel, transformation-induced plasticity steel and other advanced high-strength material categories.

These materials are used in automotive components where higher strength, lightweighting, deformation capability and structural performance are important.

3.1 Dual-Phase Steel (DP)

DP steel combines ferrite and martensite phases to achieve high tensile strength and useful formability.

HD50G50G Coating

• GMW3399M-ST-S-CR450T/250Y-DP-HD50G50G-U

• GMW3399M-ST-S-CR490T/290Y-DP-HD50G50G-U

• GMW3399M-ST-S-CR590T/280Y-DP-HD50G50G-U

• GMW3399M-ST-S-CR590T/340Y-DP-HD50G50G-U

• GMW3399M-ST-S-CR780T/420Y-DP-HD50G50G-U

• GMW3399M-ST-S-CR780T/500Y-DP-HD50G50G-U

• GMW3399M-ST-S-CR980T/550Y-DP-HD50G50G-U

HD60G60G Coating

• GMW3399M-ST-S-CR450T/250Y-DP-HD60G60G-U

• GMW3399M-ST-S-CR590T/280Y-DP-HD60G60G-U

• GMW3399M-ST-S-CR590T/340Y-DP-HD60G60G-U

• GMW3399M-ST-S-CR780T/420Y-DP-HD60G60G-U

• GMW3399M-ST-S-CR780T/500Y-DP-HD60G60G-U

• GMW3399M-ST-S-CR980T/550Y-DP-HD60G60G-U

HD70G70G Coating

• GMW3399M-ST-S-CR450T/250Y-DP-HD70G70G-U

• GMW3399M-ST-S-CR590T/280Y-DP-HD70G70G-U

• GMW3399M-ST-S-CR590T/340Y-DP-HD70G70G-U

• GMW3399M-ST-S-CR780T/420Y-DP-HD70G70G-U

• GMW3399M-ST-S-CR780T/500Y-DP-HD70G70G-U

• GMW3399M-ST-S-CR980T/550Y-DP-HD70G70G-U

Additional DP Grades

• GMW3399M-ST-S-CR450T/250Y-DP

• GMW3399M-ST-S-CR490T/290Y-DP

• GMW3399M-ST-S-CR590T/280Y-DP

• GMW3399M-ST-S-CR590T/340Y-DP

• GMW3399M-ST-S-CR690T/550Y-DP

• GMW3399M-ST-S-CR780T/420Y-DP

• GMW3399M-ST-S-CR780T/500Y-DP

• GMW3399M-ST-S-CR980T/550Y-DP

• GMW3399M-ST-S-CR980T/700Y-DP

3.2 Transformation-Induced Plasticity Steel (TR)

TRIP steel is designed to combine strength and deformation capability through transformation-induced plasticity. It can be considered for automotive structural components requiring energy absorption and forming performance.

HD50G50G Coating

• GMW3399M-ST-S-CR590T/380Y-TR-HD50G50G-U

• GMW3399M-ST-S-CR690T/410Y-TR-HD50G50G-U

• GMW3399M-ST-S-CR780T/440Y-TR-HD50G50G-U

HD60G60G Coating

• GMW3399M-ST-S-CR590T/380Y-TR-HD60G60G-U

• GMW3399M-ST-S-CR690T/410Y-TR-HD60G60G-U

• GMW3399M-ST-S-CR780T/440Y-TR-HD60G60G-U

HD70G70G Coating

• GMW3399M-ST-S-CR590T/380Y-TR-HD70G70G-U

• GMW3399M-ST-S-CR690T/410Y-TR-HD70G70G-U

• GMW3399M-ST-S-CR780T/440Y-TR-HD70G70G-U

3.3 MP-LCE Steel

The supplied GMW3399M list also includes MP-LCE designations:

• GMW3399M-ST-S-CR980T/500Y-MP-LCE HD50G50G

• GMW3399M-ST-S-CR980T/700Y-MP-LCE HD60G60G

• GMW3399M-ST-S-CR980T/700Y-MP-LCE HD70G70G

These designations should be confirmed against the original GM material specification before assigning detailed metallurgical properties or application claims.

4. How to Choose the Right GM Automotive Steel Grade?

Selecting the right automotive steel depends on the component's function, forming requirements, strength targets, corrosion protection and manufacturing process.

The following guide provides a practical starting point for material selection.

1. For General Stamping and Forming

Consider GMW2M CR1–CR5 and suitable GMW3032M conventional or specialty cold rolled grades. The choice depends on required ductility, stamping depth and surface conditions.

2. For Deep-Drawing Automotive Components

Consider IF grades under GMW3032M, such as CR180IF, CR210IF and CR240IF. These grades are relevant to components requiring excellent drawing performance and complex forming.

3. For Paint-Bake Strengthening Applications

Consider BH and B2 grades according to the applicable material specification. These grades are associated with forming performance and strength development during the automotive paint-baking process.

4. For Structural Components

LA and MC grades can be evaluated for automotive structural components, brackets and reinforcement parts requiring different strength levels.

5. For Automotive Safety and Lightweighting

Consider DP, TR, CP and MP-LCE grades according to their specified mechanical properties and component requirements. These advanced high-strength steels offer different combinations of strength, formability and deformation behavior.

6. For Corrosion Protection

Compare HD and EG coating configurations as well as uncoated materials. The required coating mass, surface quality and corrosion performance should be confirmed against the component's operating environment and GM specifications.

5. What Should Buyers Confirm Before Ordering GM Automotive Steel?

Before purchasing GM specification steel, automotive manufacturers, steel processors and distributors should confirm:

• Complete GMW specification number and revision.

• Required steel grade and material category.

• Cold rolled or hot rolled product form.

• HD, EG or uncoated surface requirement.

• Coating mass and coating type.

• Required thickness, width and dimensional tolerances.

• Mechanical properties and testing requirements.

• Surface quality and delivery condition.

• Mill Test Certificate and inspection requirements.

• Order quantity and delivery schedule.

For coated steel, buyers should distinguish between coating designations such as HD40G40G, HD50G50G, HD60G60G, HD70G70G and HD90G90G. These should not be treated as interchangeable without confirming the applicable technical requirements.

6. Source GM Automotive Steel from Solucky

Solucky provides automotive steel sourcing options covering GMW2M, GMW3032M and GMW3399M designations.

Our listed material range includes conventional cold rolled steel, hot rolled steel, galvanized steel, electrogalvanized steel, IF steel, BH steel, LA steel, MC steel, DP steel, TR steel and other advanced high-strength steel categories.

Whether you are sourcing galvanized cold rolled steel for stamping, high-strength LA steel for structural components or advanced DP and TR grades for automotive safety applications, Solucky can help review your required material designation and purchasing specifications.

Contact Solucky with your complete GM steel grade, required thickness, width, coating configuration and order quantity to discuss material availability and request a quotation.