15CrMo‑12Cr1MoV‑27SiMn‑45CrNiMoVA Special Structural Alloy Steel Bar High‑Temp & Ultra‑High Strength Bar

15CrMo‑12Cr1MoV excellent high‑temperature creep‑resistance for power‑industry high‑temp components
27SiMn cost‑effective high‑strength material specially for hydraulic cylinder blank
45CrNiMoVA ultra‑high strength for extreme heavy‑impact working environment
Complete shapes supply for power plant, hydraulic machinery, special heavy‑equipment
Strict high‑temperature alloy composition control for stable long‑time high‑temperature service

Product Overview

15CrMo,12Cr1MoV,27SiMn,45CrNiMoVA special structural alloy steel bar produced conforming to GB/T3077 standard. 15CrMo and 12Cr1MoV belong to heat‑resistant alloy steel, keep stable mechanical performance under long‑term high‑temperature working condition for boiler & power station equipment. 27SiMn is economical high‑strength silicon‑manganese alloy widely applied for hydraulic cylinder tube blank. 45CrNiMoVA is ultra‑high strength Ni‑Cr‑Mo‑V alloy for extreme heavy‑impact load components.

Available product forms: round bar, square bar, hexagonal bar, flat bar. Round bar Φ10‑350mm; square bar 10‑200mm; hex S10‑S100. Multiple delivery condition: hot‑rolled annealed, cold‑drawn precision, quenched & tempered pre‑hardened.

Application scope: boiler tube header, power‑station superheater parts, hydraulic cylinder blank, ultra‑heavy‑load impact mechanical components.

Structural Alloy Steel Bar

Chemical & Mechanical Property Snapshot

Grade	Equivalent Standard	C(%)	Si(%)	Mn(%)	Cr(%)	Mo(%)	Yield Strength Min(MPa)	Tensile Strength Min(MPa)	Elongation A5 Min(%)	Key Characteristic
15CrMo	GB/T3077	0.12‑0.18	0.17‑0.37	0.40‑0.70	0.80‑1.10	0.40‑0.55	440	440	21	High‑temperature creep‑resistance, boiler high‑temp parts
12Cr1MoV	GB/T3077	0.08‑0.15	0.17‑0.37	0.40‑0.70	0.90‑1.20	0.25‑0.35	245	490	22	Heat‑resistant alloy for power‑industry
27SiMn	GB/T3077	0.24‑0.32	1.10‑1.40	1.10‑1.40	≤0.30	‑	835	980	12	High‑strength low‑cost for hydraulic cylinder tube blanks
45CrNiMoVA	GB/T3077	0.42‑0.49	0.17‑0.37	0.50‑0.80	0.80‑1.10	0.20‑0.30	1325	1470	7	Ultra‑high‑strength alloy for impact heavy‑load application

Detailed Technical Specifications

Technical Item	Complete Specification
Product Name	15CrMo‑12Cr1MoV‑27SiMn‑45CrNiMoVA Special Structural Alloy Steel Bar
Product Category	Structural Alloy Steel Bar
Material Type	High‑Temperature / Ultra‑High‑Strength Special Alloy Structural Steel
Applicable Standards	GB/T3077
Available Forms	Round Bar, Square Bar, Hexagonal Bar, Flat Bar
Round Bar Size	Φ10‑350 mm
Square Bar Size	10‑200 mm
Hexagonal Bar Size	S10‑S100
Flat Bar	Custom dimensions available
Delivery Condition	Hot‑Rolled Annealed; Cold‑Drawn Precision; Quenched & Tempered Pre‑Hardened
Grades Included	15CrMo,12Cr1MoV,27SiMn,45CrNiMoVA
Performance Characteristics	High‑temperature creep‑resistance, high strength, ultra‑high impact‑resistance
Quality Documentation	Mill Test Certificate with chemical composition & mechanical property data
Typical Applications	Boiler header, power‑station parts, hydraulic cylinder blanks, ultra‑heavy‑load impact components
MOQ	5 Ton
Trade Term	FOB, CFR, CIF
Payment Terms	T/T, L/C at Sight
Packaging	Bundled with steel strips, waterproof wrapping, seaworthy export packing

Size Specifications Table

Product Form	Size Range	Tolerance Reference	Available Surface
Round Structural Alloy Steel Bar	Φ10 mm–Φ350 mm	Hot rolled: ±0.3–1.5 mm; Cold drawn: ±0.05–0.3 mm	Black, Peeled, Polished
Square Structural Alloy Steel Bar	10 mm–200 mm	Hot rolled: ±0.4–1.8 mm; Cold drawn: ±0.06–0.3 mm	Black, Machined
Hexagonal Structural Alloy Steel Bar	S10–S100 (across-flat dimension)	Cold drawn: ±0.08–0.3 mm	Bright / Black
Flat Structural Alloy Steel Bar	Thickness: 4–100 mm; Width: 20–300 mm	Hot rolled: ±0.5–2 mm	Black / Milled

Product Comparison Table

GB Grade	ASTM Equivalent	EN/DIN Equivalent	Density(g/cm³)	Hardenability	Main Feature	Typical Application
15CrMo	‑	‑	7.85	Low	High‑temperature oxidation & creep resistance	Boiler tube headers, high‑temperature pipeline components
12Cr1MoV	‑	‑	7.85	Low	Heat‑resistant steel, stable property under long‑term high‑temperature	Power‑station superheaters, high‑temperature pipe parts
27SiMn	‑	‑	7.85	Medium	High‑strength, low‑cost, good hardenability	Hydraulic cylinder blanks, heavy‑machinery structural blocks
45CrNiMoVA	‑	‑	7.85	Ultra‑high	Ultra‑high‑strength, strong impact resistance	Ultra‑heavy‑load impact components, special‑equipment parts

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Wind Turbine Main Shaft Blank

Mining Wear-Resistant Parts

Automotive Transmission Gears

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What working temperature for 15CrMo and12Cr1MoV bar?

They are heat‑resistant alloy for long‑term service under high‑temperature power‑boiler condition. Please refer to material specification for exact temperature limit.

What is main usage of 27SiMn alloy steel bar?

Mainly for hydraulic cylinder tube blank, cost‑effective high‑strength material.

Is 45CrNiMoVA easy for machining?

Under annealed condition it can be machined; after quenched & tempered status hardness is very high.

Are these special alloy grades available from stock?

Partial sizes have stock, most special alloy will be produced against order.

What is MOQ for special structural alloy bar?

Standard MOQ 5 tons

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15CrMo‑12Cr1MoV‑27SiMn‑45CrNiMoVA Special Structural Alloy Steel Bar High‑Temp & Ultra‑High Strength Bar