718H Steel Plate Specifications

718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel) is a pre-hardened Cr-Ni-Mo plastic mould steel plate grade under GB/YB 3Cr2NiMo; DIN 1.2738; commercial ASSAB 718H / AISI P20+Ni practice. This specification page covers grade identity, chemistry, mechanical requirements, related grades, and RFQ practice. Accept material against the ordered edition and the mill test certificate.

Grade Identity and Delivery Condition

718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel) is supplied for projects that name this designation on the purchase order or calculation sheet. Standard delivery condition is Pre-hardened typically 32-36 HRC (HH variants higher); no secondary QT required for many moulds. Gangsteel supplies export plate and related products with EN 10204 documentation. Do not accept an alternate heat-treatment route unless a written concession changes the specification requirement.

Chemical Composition - Heat Analysis (718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel))

Heat analysis for 3Cr2NiMo / 1.2738 / 718H family. Some mill datasheets tighten Si/Mn/Cr bands - confirm ordered edition.

Element / rule	Requirement
C	0.32-0.42
Si	0.20-0.80
Mn	1.00-1.50
Cr	1.40-2.00
Ni	0.80-1.20
Mo	0.30-0.55
P, max	0.030
S, max	0.030

Mechanical Properties (718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel))

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

Property	Requirement
Delivery hardness (typical pre-hard)	32-36 HRC (~300 HB)
Tensile Rm (example QT 860 C / temper 650 C)	~1000-1235 MPa (condition-dependent)
Yield Rp0.2 (example prehard ~300 HB)	~826 MPa
Elongation (example prehard)	~17%
Delivery	Pre-hardened mould plate; nitriding optional

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
DIN	1.2738	European designation
AISI	P20+Ni	Ni-modified P20
GB	3Cr2NiMo	Chinese designation

Frequently Asked Questions

What is 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel)?

718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel) is a pre-hardened Cr-Ni-Mo plastic mould steel plate under GB/YB 3Cr2NiMo; DIN 1.2738; commercial ASSAB 718H / AISI P20+Ni practice. It is ordered when drawings or the calculation sheet name this designation specifically.

What chemical composition applies to 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel)?

Controlled elements and limits are tabulated above from the governing standard. Always verify the heat analysis on the MTC against the ordered edition.

What mechanical properties should buyers expect for 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel)?

Tensile, yield, elongation, and related limits are tabulated above. Design allowables must come from the applicable pressure-vessel or structural code, not from a web summary.

What delivery condition is required for 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel)?

Standard delivery is Pre-hardened typically 32-36 HRC (HH variants higher); no secondary QT required for many moulds. State it explicitly on the PO. Do not accept an alternate route without a written concession.

How does 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel) differ from near-equivalent grades?

Near-equivalents may differ in carbon or alloy bands, tensile class, impact temperature, or heat treatment. Substitution needs engineering approval and matching certificate scope.

How do I RFQ 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel) from Gangsteel?

Send 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould steel), thickness x width x length, quantity or tonnage, delivery condition, optional impact/UT/Z tests, EN 10204 3.1 or 3.2, destination, and any dual-mark needs. Gangsteel replies with mill options, lead time, and packing notes.

Ordering and Mill Certificates

State grade 718H / 3Cr2NiMo (P20+Ni; DIN 1.2738 pre-hardened plastic mould 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.