30CrMnSiA Steel Plate Applications & Ordering Guide

30CrMnSiA (GB/T 3077 alloy structure steel) is specified for industrial fabrications where the drawing or material list names this grade. This applications page explains where the grade is used, what service conditions drive selection, and which certificate details belong on the purchase order. Gangsteel supplies 30CrMnSiA (GB/T 3077 alloy structure steel) with EN 10204 mill test certificates.

Typical Applications and Service Conditions

30CrMnSiA (GB/T 3077 alloy structure steel) plate is ordered for pressure equipment, process vessels, heat-exchanger related fabrications, structural members under the governing code, and project packages that call the grade by name. Match the mill test certificate grade mark to the calculation sheet; do not treat near-equivalents as automatic substitutes.

Service drivers include the design temperature and pressure of the governing code (ASME, EN/PED, class society, or project specification), weld procedure qualification needs, toughness or creep allowables where applicable, and inspection scope. Delivery condition Quenched and tempered for listed mechanicals; annealed/high-temp tempered supply hardness applies separately should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name 30CrMnSiA (GB/T 3077 alloy structure steel). Power and energy: boiler and heat-recovery fabrications under the ordered edition. Marine / offshore (when classed): only when the society material list names this exact grade stamp. Always keep heat-number traceability on cut pieces.

Chemical Composition - Supporting Data (30CrMnSiA (GB/T 3077 alloy structure steel))

Heat analysis per GB/T 3077-1999 for 30CrMnSiA. Residual Ni/Cu/Mo limits as tabulated for quality A grades.

Element / rule	Requirement
C	0.28-0.34
Si	0.90-1.20
Mn	0.80-1.10
Cr	0.80-1.10
P, max	0.025
S, max	0.025
Ni, max (residual)	0.30
Cu, max (residual)	0.25
Mo, max (residual)	0.10

Mechanical Properties - Supporting Data (30CrMnSiA (GB/T 3077 alloy structure steel))

Confirm thickness, specimen orientation, and any supplementary impact, UT, or hardness requirements on the PO.

Property	Requirement
Tensile Rm, min (d=25 mm QT specimen)	1080 MPa
Yield ReL/Rp0.2, min	835 MPa
Elongation A, min	10%
Reduction of area Z, min	45%
Impact KV2, min	39 J
Hardness annealed / high-temp tempered supply, max	229 HBW
Typical QT cycle	Oil quench ~880 C + temper ~520 C (confirm PO)

Related / Near-Equivalent Grades

Near-equivalents are for cross-reference only. They are not automatic code substitutes. Substitution requires engineer approval and matching certificate scope.

System	Grade	Note
GB/T 3077	30CrMnSi	Non-A sister; slightly wider residuals
Near	25CrMnSiA / 35CrMnSiA	Same family different C

Frequently Asked Questions

Where is 30CrMnSiA (GB/T 3077 alloy structure steel) typically applied?

30CrMnSiA (GB/T 3077 alloy structure steel) is applied where design documents, class material lists, or purchaser specs name this grade for pressure, process, structural, or marine fabrications as applicable. Match the MTC marking to the drawing.

What service conditions drive selection of 30CrMnSiA (GB/T 3077 alloy structure steel)?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Quenched and tempered for listed mechanicals; annealed/high-temp tempered supply hardness applies separately must align with the ordered specification.

Can a near-equivalent replace 30CrMnSiA (GB/T 3077 alloy structure steel) on an applications drawing?

Not without redesign and written approval. Near-equivalents differ in chemistry, heat treatment, impact temperature, or product form. Commercial swaps create non-conformance when the dossier names 30CrMnSiA (GB/T 3077 alloy structure steel).

What fabrication notes matter for 30CrMnSiA (GB/T 3077 alloy structure steel)?

Use approved WPS/PQR packages for the thickness and filler, control heat input, and preserve heat-number traceability on cut pieces. State any supplementary UT, PMI, or impact tests on the purchase order.

What certificate and marking should an applications PO demand?

EN 10204 3.1 is standard; 3.2 when a purchaser-appointed inspector witnesses tests. The MTC should show heat analysis, tensile results, delivery condition, and heat number aligned with 30CrMnSiA (GB/T 3077 alloy structure steel).

How should I RFQ 30CrMnSiA (GB/T 3077 alloy structure steel) plate from Gangsteel for a project?

Send 30CrMnSiA (GB/T 3077 alloy structure steel), thickness x width x length (or nesting list), quantity, delivery condition, optional NDT/PMI, certificate type, destination, and any dual-mark needs. Note the end use when special flatness or cut-to-size packaging is required.

Ordering and Mill Certificates

State grade 30CrMnSiA (GB/T 3077 alloy structure steel), dimensions, quantity, delivery condition, optional NDT/PMI, and certificate (EN 10204 3.1 standard; 3.2 when third-party inspection is ordered). Gangsteel supplies export plate and related products with mill test certificates. Contact Gangsteel for stock and mill production RFQs.