35# 45# 55# Seamless Steel Pipe

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Customization

Test:SGS or Third- party test

Delivery: 5-7days after deposit

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More Details Technical Parameter Usage Recommend Products

More Details

35# steel high quality carbon structural steel (GB/T699-2015) has good plasticity and appropriate strength, good process performance, welding performance is fair, mostly used in normalizing and tempering state.

45# is a kind of high quality carbon structural steel, corresponding to Japanese standard S45C, American standard: 1045, German standard C45. It is characterized by higher strength and deformation resistance than ordinary A3 steel.

55# is medium carbon steel with high strength. It has high surface hardness and strength after treatment, but poor plasticity and toughness, medium cutting performance, poor weldability and hardenability, and water quenching has the tendency to form cracks. Generally in normalizing or quenching.

Technical Parameter

Chemical Composition
Grade	C	Mn	P	S	Si	Cr	Ni	Cu
35#	0.32～0.39	0.50～0.80	≤0.035	≤0.035	0.17～0.37	≤0.25	≤0.30	≤0.25
45#	0.42～0.50	0.50～0.80	≤0.035	≤0.035	0.17～0.37	≤0.25	≤0.25	≤0.25
55#	0.52~0.60	0.50～0.80	≤0.035	≤0.035	0.17～0.37	≤0.25	≤0.30	≤0.25

Mechanical Property yield strength
Grade	Tensile Strength σb(MPa)	Yield Strength σs (MPa)	Elongation δ5 (%)	Reduction of area ψ(%)	hardness No heat treatment
35#	≥530(54)	≥315(32)	≥20	≥45	≤197HB
45#	≥600	≥355	≥16	≥40	≤197HB
55#	≥645	≥380（39）	≥13	≥35	≤255HB

Approximate grade contrast
GB	DIN	BS	NF	JIS	AISI
35	C25	IC35/060A35	C35	S35C/S38C	1035
45	C35	IC45/080A47	C45	S45C/S48C	1055
55	C55	IC55/07M55	C55	S55C/S58C	1045

Conventional Parameters
OD	10-2620mm
Length	5.8m,6m,11.8m,12m or Customization
Thickness	0.5-40 mm
Tolerance	±1%
Surface treatment	GI,PVC,color painting or Customization
Payment term	T/T (30% Deposit)
MOQ	5Tons
Packing	Standard Sea-worthy Packing
Standard	AISI,ASTM,DIN,JIS,GB ,JIS,SUS,EN,etc

Usage

55# is generally in normalizing or quenchingAfter use, used for parts requiring higher strength and wear resistance or elasticity, dynamic load and impact load is not large,Such as gear, rim, flat spring, crankshaft, etc., can also be used as castings.

45# steel is widely used in machinery, without heat treatment: HB≤229; Heat treatment: normalizing; Impact work: Aku≥39J; 45# steel plate after quenching without tempering, hardness greater than HRC55 (up to HRC62) is qualified, after heat treatment, and then tempering can reach HRC42-46, which can not only ensure its good mechanical properties, but also get the surface hardness requirements.

Used for making small section tempering and tempering parts with large load and large normalizing parts with small stress, as well as surface quenching parts with low requirements on core strength, such as tips, guide posts, gauges and other parts.

35# steel is widely used in the manufacture of all kinds of forgings and hot-pressed parts, cold-drawn and top-forged steel, seamless steel tubes, mechanical parts such as crankshafts, rotating shafts, shaft pins, levers, connecting rods, beams, sleeves, rims, washers, screws, nuts, motorcycle frames, etc.